Sunday
December 21, 2014

Homework Help: Science

Posted by Ava on Tuesday, February 19, 2013 at 1:25pm.

Please check my answers? My textbook won't load, so i've had to use google and guess.
1. Scientists hypothesize that the sun formed ____. (1 point)
less than a billion years ago
**from a cloud of gas and dust
less than a million years ago
from a chunk of Jupiter

2. Two of the inner planets are ____.
(1 point)
Venus and Saturn

Mars and Venus

Earth and Pluto

**Mercury and Jupiter


3. Pluto alters the orbit of which planet? (1 point)
Uranus
Saturn
**Neptune
Jupiter

4. Small pieces of rock that enter Earth's atmosphere at speeds of 15 to 70 km/s and burn up are called ____.
(1 point)
stars

meteors

**meteorites

asteroids


5. ____ is the largest planet in the solar system, is the fifth planet from the sun, and has colorful clouds. One of its 17 moons is the most volcanically active object in the solar system. The planet has a liquid ocean and an atmosphere comprised mostly of hydrogen and helium. It may have a rocky core, although its extreme pressure and temperature would make the core different from any rock on Earth.
(1 point)
Jupiter

Saturn

Uranus

**Neptune


6. Water is found as a solid, liquid, and gas on ____.
(1 point)
Mercury

Venus

**Earth

Mars


7. Galileo used his telescope to discover evidence for the sun-centered model of the solar system. This evidence included all of the following EXCEPT ____.
(1 point)
Venus going through phases

Venus revolving around the sun, not Earth

the discovery of Neptune and Pluto

**both a and b


8. A main sequence star becomes a ____ after it uses up the hydrogen in its core. (1 point)
nebula
supernova
**black hole
giant

9. Which of the letters in Figure 12-2 points to the comet's nucleus? (1 point)
A
B
C
**none of the above

10. The spiral shape of the Milky Way galaxy CANNOT be seen from Earth because ____.
(1 point)
we are located above the galaxy

we are located within one of its spiral arms

our view is blocked by the sun

**none of the above


11. Dark-colored, relatively flat regions of the moon's surface that were formed when interior lava filled large basins are called _____. (1 point)
**craters
volcanoes
maria
sedimentary rocks

12. Its _____ makes Sirius the brightest star in the night sky. (1 point)
parallax
color
**absolute magnitude
apparent magnitude

13. As Earth travels in its _____, different constellations are visible at different times of the year. (1 point)
atmosphere
**orbit
galaxy
axis

True or False
14. Our sun is a part of a binary system. (1 point)
true
**false

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