Why are there fewer molecules of air up in the mountains?

• because air pressure increases as you go higher.

• Because air pressure is the same throughout all layers of the atmosphere.

• Because air is too heavy.

• Because air pressure decreases as you go higher.

What is it called when water changes from gas to liquid?

• Freezing

• Melting

• Condesnation

• Evaporation

What preceded the growth and survival of green plants on Earth?

• the formation of severe weather

• the formation of an ozone layer

• human life

• the formation of the solar system

Which layer of the atmosphere contains the ozone layer?

• thermosphere

• exosphere

• stratosphere

• troposphere

What is the outermost layer of the atmosphere called?

• thermosphere

• stratosphere

• exosphere

• mesosphere

What form of energy transfer heats Earth?

• Recycling

• Conduction

• Convection

• Radiation

When Earth receives energy from the sun..

• some energy is reflected back into space

• some is absorbed by the atmosphere

• some is absorbed by land and water on Earth's surface

• all of the above

The amount of solar radiation that reaches Earth.

• Insolation

• Radiation

• Convection

• Conduction

The process of liquid water falling from the clouds.

• Condesation

• Precipitation

• Evaporation

• Conduction

The transfer of heat through materials that are touching each other.

• Insolation

• Radiation

• Convection

• Conduction