NASA | Ozone-rich air descends from on high

What is the primary function of the stratosphere in relation to UV rays?

• To produce oxygen for breathing

• To increase the Earth's temperature

• To protect us from harmful UV rays

• To trap heat and warm the Earth

What is a stratospheric intrusion?

• A phenomenon where ozone is depleted in the stratosphere

• A process where ozone descends from the stratosphere to the Earth's surface

• A method of measuring ozone levels in the atmosphere

• A type of pollution caused by human activities

What is the EPA's acceptable limit for ground-level ozone?

• 150 parts per billion

• 100 parts per billion

• 75 parts per billion

• 50 parts per billion

Why might states face fines related to ozone levels?

• For not planting enough trees

• For exceeding the EPA's ozone limits

• For having too many vehicles on the road

• For not reducing carbon emissions

What is the purpose of the Geos 5 model?

• To predict weather patterns

• To estimate the frequency of ozone exceedances

• To measure sea level rise

• To track animal migration