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A place where two air masses meet is called a (a)   .

The ____________________ includes all the gases around the Earth.

• hydrosphere

• biosphere

• atmosphere

• geosphere

Which statement describes how clouds form?

• Water vapor freezes an then thaws at lower altitudes.

• Water vapor in the atmosphere condenses around tiny particles of dust.

• Snow form the surface of Earth hangs in the air.

• Gases such as nitrogen and helium, combust in the atmosphere.

Where does water go when water evaporates from a puddle on the street?

• It goes into a nearby river or stream.

• It sinks into the street.

• It rises into the atmosphere.

• It goes into outer space.

Areas with higher elevations, such as mountain ranges, have ____________ temperatures.

• higher

• lower

Which two earth systems interact during a thunderstorm?

• hydrosphere and atmosphere

• biosphere and geosphere