What is the purpose of Earth's atmosphere?

• To protect the Earth from radiations and cosmic rays

• To provide oxygen for breathing

• To supply food for plants

• To create weather patterns

Tags

NGSS.MS-ESS2-6

How many main layers does the Earth's atmosphere have?

• Five

• Three

• Four

• Six

Which layer of the atmosphere is closest to Earth's surface?

• Stratosphere

• Exosphere

• Troposphere

• Mesosphere

What percentage of the air in the atmosphere is contained in the troposphere?

• About 50%

• About 75%

• About 90%

• About 65%

What is the main function of the ozone layer in the stratosphere?

• To absorb harmful ultraviolet radiation

• To create rain

• To absorb carbon dioxide

• To produce oxygen

Where do most meteors burn up when entering Earth's atmosphere?

• Mesosphere

• Troposphere

• Stratosphere

• Thermosphere

What causes the auroras that occur in the thermosphere?

• The reflection of sunlight off of ice crystals

• The collision of energetic charged particles with atoms

• The burning up of meteors

• The emission of light from stars

Tags

NGSS.HS-PS2-5

What is the outermost layer of Earth's atmosphere?

• Exosphere

• Thermosphere

• Stratosphere

• Mesosphere

At what altitude does the temperature in the atmosphere start to increase in the thermosphere?

• Above 50 kilometers

• Above 700 kilometers

• Above 10,000 kilometers

• Above 100 kilometers

Why does the temperature in the exosphere vary greatly?

• Due to the presence of water vapor

• Because of the changing distance from the Sun

• Due to the thin air not transferring much heat

• Because of the high concentration of ozone