Earth's Spheres

A group of related elements that form a complex whole is known as a _________.

• system

• party

• planet

• outpus

The thin layer of gases surrounding the planet is known as the __________.

• lithosphere

• biosphere

• atmosphere

• hydrosphere

Which are true about the atmosphere?

• • The atmosphere keeps the Earth warm.

• • The atmosphere protects us against UV radiation.

• • The atmosphere contains the gases that living things need to survive.

Which gas exists in the highest amount in the Earth's atmosphere?

• carbon dioxide

• nitrogen

• oxygen

• argon

The hydrosphere includes which of the following forms of water? Select all that apply!

• oceans

• lakes

• glaciers

• groundwater

• volcanoes

The biosphere overlaps all other spheres.

• TRUE

• FALSE

Human beings belong to the ________.

• atmosphere

• biosphere

• lithosphere

• hydrosphere