Final Review

The atmosphere is ____.

• the layer of gases that surrounds Earth

• the layer in which weather occurs

• the layer of water in the oceans

Earth's atmosphere is important to living things because it ___.

• provides all the gases that living things need to survive
• is very thin compared to the size of Earth
• contains dust and particles

Earth's atmosphere traps energy from the sun, which ____.

• allows ozone to form easily
• allows water to exist as a liquid
• causes meteors to burn up

The layer of the atmosphere in which weather occurs is the ___.

• stratosphere

• mesosphere

• troposphere

The ozone layer protects living things on Earth from ___.

• visible light
• ultraviolet radiation
• carbon dioxide

Which layer of the atmosphere protects Earth's surface from being hit by most meteroroids?

• mesosphere
• stratosphere
• troposphere

Heat transfer between two substances that are in contact is called __.

• radiation
• convection
• conduction

Heat from the sun reaches you by ____.

• convection
• radiation
• conduction

Dry air is 78% ___ and 21% ___.

• Nitrogen, Oxygen
• Oxygen, Nitrogen
• Oxygen, Carbon Dioxide

People live in the ____, or the inner layer of the atmosphere.

• troposphere
• mesosphere
• stratosphere