earth science questions !! HELP?

lilgbiddle

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1. This is the naturally occurring chemical compound that is found in the atmosphere and protects Earth from high energy ultraviolet radiation.
A) Oxygen
B) Ozone
C) Nitrogen
D) Carbon dioxide

2. What happens to the sun's radiation that reaches the Earth?
A) It is absorbed and then emitted as infrared radiation (heat).
B) It only enters through the hole in the ozone layer.
C) Very little of the sun's radiation reaching the Earth.
D) It is completely blocked by the ozone layer.

3. What are the two main gases that make up the bulk of Earth's atmosphere?
A) Carbon dioxide and oxygen
B) Nitrogen and oxygen
C) Oxygen and hydrogen
D) Hydrogen and helium

4. Which of these gases was not believed to be present on Earth at the time of its formation?
A) Nitrogen
B) Oxygen
C) Methane
D) Carbon dioxide

5. Which of these cycles does not affect our atmosphere?
A) Water
B) Carbon
C) Nitrogen
D) Helium

6. What is the primary source of heat on Earth?
A) Electromagnetic radiation from the sun
B) Global warming
C) Latent heat
D) Combustion

7. The ozone layer is located in the __________.
A) troposphere
B) thermosphere
C) mesosphere
D) stratosphere

8. The temperature on Earth remains relatively constant because __________.
A) earth is exactly the right distance from the sun
B) the ozone layers controls the heat flow
C) warm air and cool air mixes at the equator
D) the rate at which energy is added to the planet is approximately equal to the rate of energy leaving the planet

9. Conduction is the transfer of thermal energy due to __________.
A) the actual motion of a fluid in the form of currents
B) all of the choices
C) differences in density
D) direct contact of particles of matter

10. Almost all weather events occurs in the __________.
A) thermosphere
B) troposphere
C) stratosphere
D) mesosphere
 
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