Sunday
June 26, 2016

Homework Help: Science: Earth

Recent Homework Questions About Earth

earth science
What is the most abundant fossil fuel? A:Coal B:Gas C:Wood D:Oil
Sunday, April 12, 2015 by Rachel

math
what is the linear velocity of a point in Sydney, Australia which is at latitude 33deg 55'S. Radius of earth is 6370km.
Sunday, April 12, 2015 by Alice

Math
A probe launched from Earth to Mars is traveling at an average speed of 1.8 * 10^4 kilometers per hour. If the distance between Earth and Mars is approximately 2.25 * 10^6 kilometers, about how many hours will it take the probe to reach Mars? PLEASE EXPLAIN YOUR REASONING
Saturday, April 11, 2015 by Kimbo

Physics
The velocity of the Moon relative to the center of the Earth can be approximated by varrowbold(t) = v [−sin (ωt) xhatbold + cos (ωt) yhatbold], where v = 945 m/s and ω = 2.46 multiplied by 10−6 radians/s. (The time required for the Moon to complete ...
Friday, April 10, 2015 by Anonymous

science ms sue plz help
1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen ...
Friday, April 10, 2015 by need help plz

Earth Science
Which of the following are you most likely to experience a-total solar eclipse b-total lunar eclipse c-full moon d-partial lunar eclipse? my answer is full moon
Thursday, April 9, 2015 by Steve

satellite communication
If a satellite is launched at an orbital radious of twice that of a geostationary satellite ,how much time will the launched satellite take to travel around the earth ?
Wednesday, April 8, 2015 by suresh Rongali

plz help science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen ...
Wednesday, April 8, 2015 by bmx

trigonometry
You are standing on the equator of the earth (radius 3960 miles). a) what is your linear speed in miles per hour? b) what is the angular speed in radians per hour?
Wednesday, April 8, 2015 by Michael

science
these are all very confusing for me 1. Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really ...
Tuesday, April 7, 2015 by kat101

Science(need help)
1) What evidence is there that the human species has been successful so far? Explain. 2) What environmental pressures in the past do you think were most important in shaping the human species as it exists today? 3) What environmental pressures exist now that you think may be ...
Tuesday, April 7, 2015 by vivis

sience plz hep
1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen ...
Tuesday, April 7, 2015 by bmx

Physics 1
A rotating cylinder about 5.0 miles in diameter is designed to be used as a space colony. With what tangential velocity must it rotate so that the residents on it will experience the same acceleration as that due to gravity on Earth? Recall that ag=g=-9.8 m/s^2 and 1 mi=1609 m...
Tuesday, April 7, 2015 by Brittany

Astronomy
Why will detecting Earth-sized planets be much more difficult than finding Jupiter-sized planets around other stars?
Tuesday, April 7, 2015 by San Mateo College

Reading//LA
"President Lincoln’s Declaration of Emancipation, January 1, 1863" by Frances E. W. Harper 1 It shall flash through coming ages, 2 It shall light the distant years; 3 And eyes now dim with sorrow 4 Shall be brighter through their tears. 5 It shall flush the ...
Monday, April 6, 2015 by Linda

physics
The sun’s mass is about 2.7 x 107 times greater than the moon’s mass. The sun is about 400 times farther from Earth than the moon. How does the gravitational force exerted on Earth by the sun compare with the gravitational force exerted on Earth by the moon? Amoon = ...
Sunday, April 5, 2015 by Ciara

physics
At a particular point, a satellite in an elliptical orbit has a gravitational potential energy of 7000 MJ with respect to Earth’s surface and a kinetic energy of 4000 MJ. At another point in its orbit, the satellite’s potential energy is 2000 MJ. What is its kinetic ...
Sunday, April 5, 2015 by Ciara

Physics
If a person weighs 500 N on Earth, what would she weigh on Jupiter, where the acceleration due to gravity is 26 m/s2? Show all work leading to your answer.
Sunday, April 5, 2015 by Ciara

Physics
Suppose we had a straight tunnel, through Earth's center, to a point on the opposite side of the planet, and used it to deliver mail to the other side. With what speed would our packages pass through Earth's center. So: ag = (GM)/R2 Mins = (4/3)πR3*ρ So, I&#...
Saturday, April 4, 2015 by Nora

Physics
What is the ratio of the wight of a man when he is in a tunnel 1000 km below the surface of the Earth to his weight at the surface? ...I'm not sure how to proceed, not because I don't know how to do it, but because I have no idea how to come up with a(g) 1000 km inside...
Saturday, April 4, 2015 by Nora

Science
Which statement describes the relationship among the sun wing and ocean currents A. The sun heats the ocean surface causing water to evaporate producing wind currents B.The sun heats earth unequally cuaing winds that drive ocean surface currents C.The sun heats the air and the...
Wednesday, April 1, 2015 by M

History
1. Why is Lincoln giving a speech at Gettysburg? A.To declare the Confederacy an outlaw nation B.To declare that to goal of the Union is to abolish slavery C.To dedicate a national cemetery for Union and Confederate dead D.To try Confederate soldiers for treason A? 2.When ...
Wednesday, April 1, 2015 by M

Physic
If your weight on Earth is 637 Newton, what is your mass in kg?
Wednesday, April 1, 2015 by Christian

Mathematics
The distance to the nearest 100,000 km from the earth to the moon is given as 400,000 km. The average speed to the Nearest 500km/h is 3500km/h. Calculate the least and greatest time it takes the rocket to reach the moon  I figured out the formula speed = distance / time ...
Tuesday, March 31, 2015 by Fay

math
The distance to the nearest 100,000 km from the earth to the moon is given as 400,000 km. The average speed to the Nearest 500km/h is 3500km/h. Calculate the least and greatest time it takes the rocket to reach the moon I figured out the formula speed = distance / time but ...
Tuesday, March 31, 2015 by Tay

science PLZ HELP
electric charges that are different A) attract each other B) repel each other C) exist in pairs D) do not interact Magnetic field lines around a bar magnet A) are only perpendicular to the magnet B) spread out from one pole and curve around the other C) cross back and forth ...
Tuesday, March 31, 2015 by Anonymous

Precalculus
Find an equation of the circular orbit of a satellite 500 miles above the surface of earth. Place the origin of the rectangular coordinate system at the center of Earth and assume that the radius of Eatch is 4000 miles.
Sunday, March 29, 2015 by Anonymous

Physics
The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × ...
Sunday, March 29, 2015 by Kristyn

physics
The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing ...
Saturday, March 28, 2015 by Kristyn

Earth Space Science
the horizontal distance between a crest to the next trough of an ocean wave is 5 meters. what is the wavelength of the ocean wave? A)2 meters B)5 meters C)10 meters D)20 meters I think its 10 meters but im not so sure, I would like to make sure.
Saturday, March 28, 2015 by Sierra

physics
The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing ...
Saturday, March 28, 2015 by Kristyn

physics
mercury rotates about its own axis once every 58.6 Earth days. a satellite orbits mercury once every murcurian day. how high is this satellite above mercury's surface? mass of mercury = 3.2x10^23 kg. the radius of mercury is 2400km.
Saturday, March 28, 2015 by khalifah

PHYSICS HELP
Suppose the aliens watching the show are on the surface of Mars. Mass of Mars: 6.42 x 10^23 kg Radius of Mars: 3.394 x 10^6 m Calculate; A) the weight of a 40.0 kg alien on Mars B) the weight of 40.0kg alien on earh Earth-sun distance:1.50x10^11m Mars-sun distance: 2.28 x10^11...
Thursday, March 26, 2015 by Maddie

astronomy
The distance from Earth of the red supergiant Betelgeuse is approximately 643 light-years. If it were to explode as a supernova, it would be one of the brightest stars in the sky. Right now, the brightest star other than the Sun is Sirius, with a luminosity of 26LSun and a ...
Thursday, March 26, 2015 by Anonymous

Earth science
how does the temperature of ocean currents affect climate?
Wednesday, March 25, 2015 by Daniela

physics
An object is projected from the surface of the earth with a speed of 2.73x10^4 m/s. What is its speed when it is very far from the earth? (Neglect air resistance).
Tuesday, March 24, 2015 by Kristen

PHYSICS -urgent
A bomber in level flight, flying at 92m/s, releases a bomb at a height of 1950m. (a) How long is it before the bomb strikes earth? (19.9s) (b) How far does it travel horizontally? (1832m) (c) What are the horizontal and vertical components of its velocity when it strikes? (...
Tuesday, March 24, 2015 by eddie

Biology
The metabolic pathways of organism living today evolved over a long period of time- undoubtedly in a step wise fashion because of their complexity. Considering everything you have learned to date about the evolution of life on Earth, put the following in the order in which ...
Monday, March 23, 2015 by Trinh

Earth science
What kind of front sometimes spawns tornadoes between an advancing cold and dry air mass and a warm moist air mass? 1) cold 3) stationary 2) warm 4) occluded
Monday, March 23, 2015 by Daniela

Earth science
13 of the19 lives lost you to the Wichita Andover tornado were at the mobile home park in Andover. Even though there was some advanced warning what could explain the relatively high death toll at this location?
Sunday, March 22, 2015 by Daniela

physics
a 70 kg block rests on the earth's surface. How much energy is required to move the block very far from the earth, ending up at rest again?
Sunday, March 22, 2015 by paul

science
1.why is freshwater a limited resource? a)because most water on earth is in lakes** b)because most water on earth is in clouds c)because most water on earth is in the ground d)because most water on earth is salt water
Sunday, March 22, 2015 by HOMEWORK

application of differential equation
somebody please help me find the solution totally lost.... An object of mass 100g is thrown vertically upward from a point 60cm above the earths surface with an initial velocity of 150cm/sec. It rises briefly and then falls vertically to the earth, all of which time it is ...
Saturday, March 21, 2015 by maria

application of differential equation
An object of mass 100g is thrown vertically upward from a point 60cm above the earths surface with an initial velocity of 150cm/sec. It rises briefly and then falls vertically to the earth, all of which time it is acted on by air resistance that is numerically equal to 200v (...
Saturday, March 21, 2015 by maria

differencI also equation
An object of mass 100g is thrown vertically upward from a point 60cm upabove the earth's surface with an initial velocity of 150cm/sec
Saturday, March 21, 2015 by auguste nande

Science!
1. What would happen to an object if the force of gravity on Earth was decreased by half? (1 point) Its mass would decrease. Its weight would decrease.* Its density would decrease. Its volume would decrease. 2. Which of the following represents a heterogeneous mixture? (1 ...
Friday, March 20, 2015 by Bella

math
An object of mass 100g is thrown vertically upward from a point 60cm above the earths surface with an initial velocity of 150cm/sec. It rises briefly and then falls vertically to the earth, all of which time it is acted on by air resistance that is numerically equal to 200v (...
Friday, March 20, 2015 by Meitavelo Himufe

Help with physics!
Hi! I need some help with some physics questions. 1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces? a. both forces stay the same b. gravitational force stays the same but electric force increases c. ...
Thursday, March 19, 2015 by N.

Physics
For the normal force exerted on the book by the wedge in the diagram, which force(s) complete(s) the force pair for Newton’s third law (action-reaction)? 1) the sum of the component of gravity perpendicular to the surface of the incline and the component of Fhand ...
Thursday, March 19, 2015 by kurtis

Science
1. Which type of weather technology often carries cameras that can make images of Earth's surface, clouds, and snow cover? A. weather balloon B. weather satellite**** C. computer D. automated weather station 2. Why are weather forecasts more reliable now compared to ...
Thursday, March 19, 2015 by Bob

Quick English check
(21) Before they leave this festival, many visit the insect petting zoo. (22) Scientists believe some insects have been on Earth since prehistoric times. (23) Children line up for the opportunity to hold strange bugs of all kinds. (24) Most people agree that Purdue's Bug ...
Wednesday, March 18, 2015 by Anonymous

Science
what is the distance above Earth's surface?
Wednesday, March 18, 2015 by Judah

english
These are the times that try men’s souls: The summer soldier and the sunshine patriot will, in this crisis, shrink from the service of his country; but he that stands it NOW, deserves the love and thanks of man and woman. Tyranny, like hell, is not easily conquered; yet ...
Wednesday, March 18, 2015 by jimm

Physics
Hi! I need some help with some physics questions. 1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces? a. both forces stay the same b. gravitational force stays the same but electric force increases c. ...
Tuesday, March 17, 2015 by N.

science
In which of the following statement the word light year is used correctly? (A) Ceres dwarf galaxy is 2.46 million lightyear away from us.(B) light travels with the speed of 1 lightyear in the universe (c) the next complete solar eclipse will be seen after 32 light year. (D) ...
Monday, March 16, 2015 by sanjay

physics electromagnetism
Two long parallel vertical wires 0.3m apart are. ' placed east-west of one another. The current in the westerly wire is 30A and on the other 20A. The horizontal component of the earths magnetic flux density is 2*10^-5. Find the force per unit length on each wire. (The ...
Sunday, March 15, 2015 by pascal

PHYSICS
The gravitational forces of the Earth and the Moon are attractive, so there must be a point on a line joining their centers where the gravitational forces on an object cancel. How far is this distance from the Earth's center?
Sunday, March 15, 2015 by Physics

earth
When earth is seen from outer space,it looks mainly blue. This is because most of the earth is covered with.
Saturday, March 14, 2015 by leslie

Science Help Please
1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength *** D.amplitude and frequency...
Friday, March 13, 2015 by frazzled

Science Help Please
1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength *** D.amplitude and frequency...
Friday, March 13, 2015 by frazzled

Physics
A mass of 5Kg is 1st weighed on a balance at the top of a tower 20m high.The man is then suspended from a fine wire 20m long and reweivhed.find the difference in a weight ,assuming that the radius of the earth is 6400km,the mass of the earth is 6×10^24kg and G=6.673&...
Friday, March 13, 2015 by Olushola

Physics
At New York City, the earth's magnetic field has a vertical component of that points downward (perpendicular to the ground) and a horizontal component of that points toward geographic north (parallel to the ground). What are the magnitude and direction of the magnetic ...
Thursday, March 12, 2015 by Aggie

science
How long dose it take the moon to rotate once and how many days dose it take to orbit the earth
Wednesday, March 11, 2015 by kevenhotdog74@

Could someone check my answers please? :)
1. How did planetesmals form planets? (1 point) A. They broke apart into smaller chunks. B. They collided and stuck together.** C. They cooled and pulled ice together. D. They began to rotate. 2. Which parts of the sun’s atmosphere become visible during a total solar ...
Wednesday, March 11, 2015 by coolkid

algebra--1 question
Radio signals travel at a rate of 3 * 10^8 meters per second. How many seconds would it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 9.6 * 10^6 meters? (1 point) 3.2 x 10^2 seconds 3.2 x 10^-2 seconds 3....
Wednesday, March 11, 2015 by SkatingDJ

language arts
WEDNESDAY March 11, 2015 SCHOOL SUBJECTS Art Business Computers English Foreign Languages Health Home Economics Math Music Physical Education Science Social Studies GRADE LEVELS Preschool Kindergarten Elementary School 1st Grade 2nd Grade 3rd Grade 4th Grade 5th Grade 6th ...
Wednesday, March 11, 2015 by hello

Religion
Many Christians seem to accept modern cosmology - Galileo's view that the earth is not the center of the Universe - while at the same time disagreeing with the theory of evolution. For this discussion, we will focus on the following questions (in 250 words total): 1. Why ...
Wednesday, March 11, 2015 by Larcey

Physics
A strong lightning bolt transfers about 21.45 C to Earth. How many electrons are transferred? The elemental charge is 1.602 × 10^−19 C.
Tuesday, March 10, 2015 by Jess

Functions - Please Help
In 2001, Windsor, Ontario received its maximum amount of sunlight, 15.28 hrs, on June 21, and its least amount of sunlight, 9.08 hrs, on December 21. 1) Due to the earth's revolution about the sun, the hours of daylight function is periodic. Determine an equation that can ...
Monday, March 9, 2015 by Help Please

physics
How many kilometers would you have to go above the surface of the earth for your weight to decrease to 39{\rm \\%} of what it was at the surface? Express your answer using two significant figures.
Monday, March 9, 2015 by danny

ap physics
(a) Calculate the angular momentum of Earth that arises from its spinning motion on its axis, treating Earth as a uniform solid sphere. J · s (b) Calculate the angular momentum of Earth that arises from its orbital motion about the Sun, treating Earth as a point ...
Sunday, March 8, 2015 by yesica

astronomy
The peak luminosity of a white dwarf supernova is around 10^10LSun and it remains above 10^8LSun for about 150 days. In comparison, the luminosity of a bright Cepheid variable star is about 10000LSun.The Hubble Space Telescope is sensitive enough to make accurate measurements ...
Saturday, March 7, 2015 by Landy

Science
according to ohm's law, what is the resistance of light bulb if the applied voltage is 21.0V and the current is 3.0 amps a 24 ohms b 7.0 ohms**** c 18 ohms d 3.0 ohms a student studying a circuit diagram of a light bulb, battery and a switch correctly identifies it as a ...
Thursday, March 5, 2015 by BUBBLES

physics
The power output in the sun is about 4.00 x 10^26W. (a). Calculate the power per unit area (intensity), in kilowatts per square meter, reaching Earth's upper atmosphere from the sun. The radius of the Earth's orbit is 1.5 x 10^11m.
Thursday, March 5, 2015 by Anonymous

using skills
Which earth science lesson is especially appropriate for the primary grades? A. Moon B. Volcanoes C. Stars D. Weather my answer is d.
Thursday, March 5, 2015 by lauren

earth
what is 15 times 12
Wednesday, March 4, 2015 by sam

7th grade science
how much work is done on an object with 25 kg on earth if it moves 13m? i really need help
Tuesday, March 3, 2015 by KVNG J

Physics
Can someone walk me through how to work this? It's worded weirdly and I'm not sure how to solve it. Mass M1= 2.2 kg lies on a frictionless table, pulled by another mass M2= 4.1 kg under the in of Earth's gravity. a) What is in N the net force acting on the system ...
Tuesday, March 3, 2015 by James

Earth Science
What color will a star be with a surface temperature of 5000–6000 K? A. blue B. yellow C. white my choice is B yellow
Tuesday, March 3, 2015 by Emi

Earth Science
Which of the following is NOT generally associated with a thunderstorm? A. tornado B. lightning C. dry air
Tuesday, March 3, 2015 by Emi

physics
The weight of an object is 480N on the earth and 120N on the moon,calculate the mass of the object on the moon
Tuesday, March 3, 2015 by rebone

physics
If a man weighs 820N on d earth what would be on Jupiter, where the acceleration due to gravity is 25.9m/s
Tuesday, March 3, 2015 by ikeokwu stephen chidebere

Calculus Physics
Imagine a spaceship on its way to the moon from the earth. Find the point, as measured from the center of the earth, where the force of gravity due to the earth is balanced exactly by the gravity of the moon. This point lies on a line between the centers of the earth and the ...
Monday, March 2, 2015 by danny

science
Part I: Units of Measurement for Gas Laws For the following questions, use the following answer choices to indicate what each unit of measurement is used to measure (pressure, volume, or temperature). 1. atm 2. kPa 3. L 4. oC 5. torr 6. K 7. mL 8. cubic centimeters (cm3) ...
Monday, March 2, 2015 by Alex

Physical science
The diameter of the planet saturn is 10 times that of the earth but the mass of the planet is only 90 times greater than that of the earth.what isthe gravitational acceleration(or number of 'gs'you"ll feel)on saturn?
Monday, March 2, 2015 by Thando

Earth Science
Which of the following organisms is most likely to survive? A. the top carnivore in a food chain B. a herbivore in a food chain C. the top carnivore in a food web
Monday, March 2, 2015 by Emi

Chemistry
What is the magnitude of the orbital velocity of the earth when the radius of the earth's orbit around the sun is 150000000?
Sunday, March 1, 2015 by Flora

Physics 1
In recent years, scientists have discovered hundreds of planets orbiting other stars. Some of these planets are in orbits that are similar to that of earth, which orbits the sun (Msun = 1.99 × 10^(30) kg) at a distance of 1.50 × 10^(11) m, called 1 astronomical ...
Sunday, March 1, 2015 by Skyler

physics
A 39-turn circular coil of wire has a diameter of 1.2m. It is placed with its axis along the direction of the Earth's magnetic field of 58μT at 52° below the horizontal, and then in 0.16s it is flipped 180°. a) What is volts the magnitude of the average ...
Saturday, February 28, 2015 by Katie

Earth Science
Which of the following does NOT occur at a convergent boundary? A. The leading edges of both plates are bent downward. B. Oceanic crust is pushed down into the mantle. C. One continental plate moves into an oceanic plate. I think it's C
Saturday, February 28, 2015 by Emi

Earth Science - Please Check My Answer
Please help with the following: How does sleet differ from snow? A. It is not a form of precipitation. B. It is liquid and not ice. C. It starts as rain and freezes in the air. D. It starts as water vapor and changes to a solid. I know that answer is not D because I got it ...
Friday, February 27, 2015 by Brady

Earth Science
2.   The Moon is made up of minerals similar to those on Earth, which are  A. rilles. B. lunar breccias. C. silicates. D. highlands. I am thinking either B or D?
Thursday, February 26, 2015 by Sarah

math
The Position of two A and B on the earth’s surface are (36°N, 49°E) and (36°N, 131°W ) respectively. (a) The difference in long between town A and town
Thursday, February 26, 2015 by kudu

Physics
Calculate the weight of an astronaut whose mass (including spacesuit)is 72kg on the surface of the moon? What is the astronauts weight on Earth? Comment on the difference
Wednesday, February 25, 2015 by Nicole

math
A vector can be used to represent the path of a drill tip used to bore a deep mine shaft in Sudbury one quarter of the way to the centre of the Earth. Represent the vector using a directed line segment and Cartesian co-ordinates and describe which representation may be more ...
Wednesday, February 25, 2015 by aristotle

Earth Science
Hubble said that stars are moving away from the Earth because they have more of what color? Blue, Green, Red or Violet
Wednesday, February 25, 2015 by Alexgc

physical science
If the mans weight is 490N on earth,calculate his weight on the moon that has the gravitational force 1/2 of the gravitational force of the aerth
Wednesday, February 25, 2015 by nelson

Earth Science to Ms.Sue (urgent )
18.   The Cenozoic Era is also referred to as the  A. Age of Dinosaurs. B. Age of Mammals. C. Age of Fish. D. First Era. B???
Tuesday, February 24, 2015 by Sarah

Earth Science to Ms.Sue
9.   Another name for unicellular organisms that dominated Earth up to the Precambrian time is  A. eukaryotes. B. cyanobacteria. C. stromatolites. D. prokaryotes. D?
Tuesday, February 24, 2015 by Sarah

Earth Science
Why does the Earth have a magnetic field?
Tuesday, February 24, 2015 by Alexgc

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Homework Help: Science