The atmosphere

The Earth’s atmosphere is made of

• air

• water

• a mixture of gases

• minerals

The atmosphere is mostly

• oxygen

• CO2

• H2O

• nitrogen

A small percentage of the atmosphere is

• oxygen and nitrogen

• carbon dioxide

• other gases

The Earth's atmosphere started to form

• 4.400 million years ago

• 6.000 million years ago

• 3.500 million years ago

The atmosphere

• has always been the same

• has gained Hydrogen

• gained Oxygen due to bacterial activity

The atmosphere

• protects us

• is not important to life

• allows us to breath

The Earth's atmosphere has

• 5 layers

• 2 layers

• 3 layers

As you go higher

• gases become thinner

• become thicker

The lowest layer is the

• stratosphere

• exosphere

• troposphere

• mesosphere

Select the right order

• troposphere, mesosphere, stratosphere, thermosphere, exosphere

• troposphere, stratosphere, mesosphere, thermosphere, exosphere

• stratosphere, mesosphere, troposphere, thermosphere, exosphere