Thursday
April 24, 2014

Homework Help: Earth science

Posted by Ario on Friday, January 29, 2010 at 1:43am.

Please go over my answers and tell me what I got wrong... Telling me the correct answer would also be nice please hurry I only have 20 mins


What does the principle of uniformitarianism tell us about the past? (Points: 5)
The past is the key to the future.
X The present is the key to the past.
Processes at work in the past were very different than those at work today.
The past has no bearing on the future or present.


2. The Pacific Ocean is shrinking while the Atlantic Ocean is expanding. Which type of plate boundary must be involved in each location? (Points: 5)
Pacific Ocean, convergent; Atlantic Ocean, divergent
Pacific Ocean, transform; Atlantic Ocean, convergent
Pacific Ocean, convergent; Atlantic Ocean, transform
X Pacific Ocean, divergent; Atlantic Ocean, transform


3. The theory of plate tectonics explains the movement of the plates by convection cells in which of the following layers? (Points: 5)
upper mantle
X mantle
outer core
crust


4. Which of the following may occur at a transform plate boundary? (Points: 5)
X earthquakes
volcanoes
mountain building
formation of new oceanic crust


5. Earthquakes are detected by which of the following? (Points: 5)
global positioning system
X seismograph
Richter scale
tiltmeter


6. Which of the following statements about S waves is true? (Points: 5)
S waves travel through solids, liquids, and gases.
S waves arrive at a seismograph station first.
X S waves are also called secondary waves.
S waves move in a pulsating motion.


7. Why is coal not a mineral? (Points: 5)
It does not occur naturally.
It does not have a regular composition.
X It is organic.
It is not a solid.


8. In a laboratory, you scratch an unknown mineral on a piece of unglazed porcelain. Which property are you trying to determine? (Points: 5)
fracture
color
luster
X streak


9. Which of the following best describes an igneous rock that formed from cooling lava? (Points: 5)
without grains
foliated
stratified
X fine grained


10. Sedimentary rocks that form from evaporating seawater are classified as __________. (Points: 5)
clastic
X chemical
organic
fossiliferous


11. How do metamorphic rocks form? (Points: 5)
cooling of magma
X change due to heat and pressure
evaporation of seawater
weathering and erosion due to water


12. Which of the following is an example of chemical weathering? (Points: 5)
Freezing and thawing rainwater widens a crack in a sidewalk.
A growing tree root splits a boulder in two.
A stream rounds and smoothes rocks into pebbles.
X Acid rain discolors and disfigures a limestone statue.








14. The sun’s energy hits earth’s surface at the most direct angle at which of the following locations? (Points: 5)
equator
North Pole
South Pole
X 30° N or S latitude


15. Why does temperature increase with altitude through the stratosphere? (Points: 5)
X The air molecules are closer together in the upper stratosphere.
The stratosphere is closest to the sun.
The ozone layer is found in the stratosphere.
All layers of the atmosphere increase in temperature with altitude.


16. Which gas is the most abundant in earth’s current atmosphere? (Points: 5)
carbon dioxide
oxygen
X nitrogen
hydrogen


17. Which of the following was a major source of atmospheric oxygen? (Points: 5)
outgassing
X photosynthesis
decomposition of water
volcanic eruptions


18. What does a barometer measure? (Points: 5)
temperature
wind speed
X atmospheric pressure
air density


19. If heat energy is transferred from direct contact between a warm object and a cold object, it has been transferred by __________. (Points: 5)
radiation
conduction
X convection
the sun


20. What causes the Coriolis effect? (Points: 5)
X earth’s rotation
gravity
radiation from the sun
earth’s revolution


21. The flow of air from land to a body of water is called a(n) __________. (Points: 5)
X sea breeze
summer monsoon
land breeze
air current


22. Which of the following statements is most accurate? (Points: 5)
Warm air sinks.
Warm air exerts more pressure on the land than cold air.
X Warm air is less dense than cold air.
Warm air is denser than cold air.


23. Which of the following best describes the thermosphere? (Points: 5)
Heavier gases such as hydrogen and helium stay at the bottom of the thermosphere.
The atmosphere is so thin that gas molecules rarely contact each other.
X Lighter gases such as nitrogen and oxygen rise to the top of the thermosphere.
The thermosphere sits directly below the troposphere.


24. Tomorrow will be sunny with high clouds. What does this statement describe? (Points: 5)
X the weather
the climate
air circulation
jet streams


25. Which of the following is one of the defining features of a hurricane? (Points: 5)
funnel cloud
low pressure
X high pressure
rapid snowfall

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