Unit B: Atmosphere Review

What is the best definition for the atmosphere?

• The layer of water covering Earth’s surface.

• A thin layer of gases that form a protective covering

  around the planet.

• The layer of gases in which weather occurs.

• The layer of continental and oceanic crusts.

What are the two most abundant gases in Earth's

atmosphere?

• Carbon Dioxide and Oxygen

• Carbon Dioxide and Nitrogen

• Nitrogen and Oxygen

• Nitrogen and Water Vapor

Which layer touches outer space?

• Stratosphere

• Mesosphere

• Exosphere

• Troposphere

Which molecule within the atmosphere is responsible for

blocking UV rays from the sun?

• ozone

• methane

• carbon dioxide

• nitrogen

What happens to air pressure as altitude increases?

(Think about the top of a mountain)

• Increases - the higher you go, the more pressure you

  feel

• Decreases – the higher you go, the less pressure you

  feel

• Stays the same

• The change is unknown

What gas is necessary for humans to breathe? What

percentage of Earth's atmosphere is it?

• nitrogen, 21%

• nitrogen, 78%

• oxygen, 78%

• oxygen, 21%

Why does the air density decrease with increasing

altitude within Earth's atmosphere?

• Air density decreases with increasing altitude because

  more atoms escape into outer space.

• Air density decreases with increasing altitude because

  temperature decreases with increasing altitude.

• Air density decreases with increasing altitude because

  at higher altitudes there are fewer air molecules and

  these molecules are further apart.

• Air density decreases with increasing altitude because

  energy from the sun pushes the air particles closer to

  Earth.

Which layer contains the ozone layer?

• It is its own layer

• Thermosphere

• Mesosphere

• Stratosphere

Where do most of the meteorites burn up in?

• Exosphere

• Mesosphere

• Troposphere

• They don’t burn up in the atmosphere.

Which chemical causes ozone depletion?

• Hydronomoreozone

• GCCs

• Car emissions

• CFCs