The Atmosphere

What percent of Earth's atmosphere is made up of nitrogen?

• 45%
• 40%
• 72%
• 78%

What layer is closest to Earth's surface?

• ionsphere
• troposphere
• stratosphere
• exosphere

___ pulls all objects toward Earth.

• gravity
• molecules
• density
• atmosphere

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Temperature ______ as altitude increases in the troposphere.

• decreases
• stays the same
• increases
• stops

Tags

NGSS.MS-ESS2-6

Cold air is ______ than warm air.

• denser
• lighter
• prettier
• brighter

How are the upper and lower parts of the stratosphere different?

• The upper part is warmer than the lower part
• The upper part has more ozone 
• The upper part is colder than the lower part
• The upper part ihas less ozone

Why do people need to wear sunscreen at the beach?

• To protect themselves from infrared light
• To protect themselves from UV rays

Layer of the atmosphere where the ozone layer is located:

• troposphere
• stratosphere
• mesosphere
• thermosphere

As altitude increases in the Troposphere, what happens to the air temperature?

• air temperature increases
• temperature decreases
• temperature fluctuates
• temperature rises

Where you will find the ozone layer.

• stratosphere
• thermosphere
• exosphere
• mesosphere