Earth's Atmosphere and Its Layers

What is the main purpose of Earth's atmosphere?

• To create wind for flying kites.

• To hold all of Earth's air and protect the planet.

• To make the sky blue.

• To reflect sunlight back into space.

Which two gases make up the largest part of Earth's atmosphere?

• Carbon dioxide and water vapor

• Oxygen and Argon

• Nitrogen and Oxygen

• Methane and Helium

How does air pressure change as you go higher up from Earth's surface?

• It increases.

• It decreases.

• It stays the same.

• It changes randomly.

Which layer of the atmosphere is closest to Earth's surface and where most weather events happen?

• Stratosphere

• Mesosphere

• Troposphere

• Exosphere

What important layer is found in the stratosphere that protects Earth from harmful radiation?

• Cloud layer

• Ozone layer

• Water vapor layer

• Nitrogen layer

What special event happens in the mesosphere when small space rocks enter Earth's atmosphere?

• Rainbows

• Thunderstorms

• Meteor showers

• Auroras

Where are most of the gases in Earth's atmosphere found?

• In the exosphere

• In the thermosphere

• In the first three layers closest to Earth

• Spread evenly throughout all layers

Which layer of Earth's atmosphere is known for the Northern and Southern Lights (auroras)?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

What are the main gases found in the exosphere?

• Oxygen and Nitrogen

• Carbon Dioxide and Water Vapor

• Hydrogen and Helium

• Methane and Ozone

What is the name of the imaginary line that marks the boundary where a spacecraft enters outer space?

• The Ozone Layer

• The Karman Line

• The Exobase

• The Mesopause