On what basis are the layers of the atmosphere categorized?

• The amount of clouds in each layer

• The type of gases in each layer

• How temperature varies with height

• The amount of precipitation in each layer

Which layers of the atmosphere have a greater density and therefore a greater pressure?

• Layers closest to the sun

• Layers closest to the moon

• Layers closest to the earth

• Layers farthest from the earth

What is atmospheric pressure?

• The humidity level in the air

• The temperature of the air

• The force or mass per unit area of air

• The amount of oxygen in the air

At what altitude does the Thermosphere start?

• 50 km

• 80 km

• 170 km

• 520 km

Which layer of the atmosphere is directly above the Stratosphere?

• Troposphere

• Mesosphere

• Thermosphere

• Exosphere

What is the approximate temperature at the boundary between the Mesosphere and the Thermosphere?

• -100°C

• 0°C

• 100°C

• 500°C

Which layer of the atmosphere is the highest according to the diagram?

• Troposphere

• Stratosphere

• Mesosphere

• Exosphere

Which layer of the atmosphere is closest to the Earth?

• Stratosphere

• Mesosphere

• Troposphere

• Thermosphere

What percentage of the total atmospheric mass is found in the Troposphere?

• 50%-60%

• 75%-80%

• 90%-95%

• 65%-70%

How does temperature change with altitude in the Troposphere?

• Temperature increases with altitude.

• Temperature remains constant with altitude.

• Temperature decreases with altitude.

• Temperature fluctuates unpredictably with altitude.