Mark each statement that correctly explains the importance of our atmosphere.

• It helps organisms on the surface of Earth experience gravity.

• It blocks harmful UV radiation from the sun.

• It warms up the surface of the Earth.

• It prevents large swings between daytime and nighttime temperatures.

Tags

NGSS.MS-ESS2-6

What is the most common gas in our atmosphere?

• oxygen

• nitrogen

• carbon dioxide

• water vapor

Approximately what percentage of our atmosphere is made of oxygen?

• 78%

• 50%

• 21%

• 1%

As you move from Earth's surface towards space, how does the density and pressure of the air change?

• The density of air increases and the air pressure decreases.

• Both the density and pressure of air increase.

• Both the density and pressure of air decrease.

• The density of air decreases and the air pressure increases.

Which layer of the atmosphere do we live in?

• stratosphere

• mesosphere

• thermosphere

• troposphere

This molecule is important because it absorbs harmful UV radiation.

• methane

• ozone

• carbon dioxide

• nitrogen

Because this layer contains 99% of all water vapor, nearly all weather happens here.

• stratosphere

• mesosphere

• thermosphere

• troposphere

Tags

NGSS.MS-ESS2-5

NGSS.MS-ESS2-6

This is the HOTTEST layer of the atmosphere.

• thermosphere

• mesosphere

• stratosphere

• troposphere

This is the COLDEST layer of the atmosphere.

• thermosphere

• mesosphere

• stratosphere

• troposphere

Which layer of the atmosphere contains the ozone layer?

• thermosphere

• mesosphere

• stratosphere

• troposphere