Layers of the Atmosphere

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

• Oxygen, Nitrogen

• Nitrogen, Oxygen

• Nitrogen, Carbon Dioxide

• Oxygen, Carbon Dioxide

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

• Stratosphere

• Exosphere

• Mesosphere

• Troposphere

Why is the ozone layer vital to life on Earth?

• Planes fly in the ozone layer

• It is made up of oxygen (O₂)

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

• It causes clouds to be created

In which layer of the atmosphere do meteors burn up?

• Troposphere

• Mesosphere

• Thermosphere

• Exosphere

This layer is the hottest layer of the atmosphere?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

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

• Exosphere

• Mesosphere

• Thermosphere

• Ozone Layer

Which explanation correctly describes the greenhouse effect?

• The process of the atmosphere keeping the Earth's surface dense

• The process of the atmosphere trapping the sun's radiation, and making the Earth warm and livable for humans

• The process of the atmosphere keep us from floating into space

• The process of the atmosphere reflecting all of the Sun's heat back into space

It is the lowest layer of the atmosphere.

• stratosphere

• mesosphere

• thermosphere

• troposphere

In which layer do you live?

• stratosphere

• troposphere

• mesosphere

• thermosphere

The most abundant gas in the atmosphere is ________.

• carbon dioxide

• argon

• nitrogen

• oxygen