The Earth’s atmosphere

What are the two main gases that make up the Earth’s atmosphere?

• Hydrogen and Carbon

• Nitrogen and oxygen

• Oxygen and Hydrogen

In which layer do satellites orbit the Earth?

• Nanosphere

• Thermosphere

• Troposphere

Which is the densest part of the atmosphere?

• Mesosphere

• Stratosphere

• Troposphere

The _________ layer protects us from harmful radiation from the sun.

The uppermost layer of the atmosphere is called

• Exosphere

• Photosphere

• Stratosphere