Front

78% of the Earth's atmosphere is ___________ and 21% of the Earth's atmosphere is _____________.

Back

Nitrogen, Oxygen

Front

In what layer of the atmosphere do all weather events occur?

Back

Troposphere

Front

In the troposphere, the temperature _____ as altitude increases.

Back

Decreases

Front

Why is the ozone layer vital to life on Earth?

Back

It shields the Earth from ultraviolet (UV) rays from the sun

Front

In which layer of the atmosphere do meteors burn up?

Back

Mesosphere

Front

This layer is the hottest layer of the atmosphere?

Back

Thermosphere

Front

This layer is the outermost layer of the atmosphere. Satellites orbit the atmosphere in this layer.

Back

Exosphere

Front

Order of the layers of the atmosphere, starting with the layer closest to Earth's surface.

Back

Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere

Front

What absorbs ultraviolet rays in the atmosphere?

Back

ozone layer

Front

What are the two most common gases in the atmosphere?

Back

Nitrogen and oxygen