Unit 5 review

Volcanic activity cannot occur at a mid-ocean ridge.​

The oldest crust forms at a mid-ocean ridge

The thinnest oceanic lithosphere forms at a mid-ocean ridge

New continental lithosphere forms at a mid-ocean ridge.

Sandstone​

Granite​

Basalt

Quartzite

Lithosphere

Biosphere

Atmosphere

Hydrosphere

Nitrogen gas cannot bond with other elements

Nitrogen gas always bonds with carbon

Nitrogen gas makes up a small fraction of the atmosphere

Nitrogen gas does not occur naturally

Ammonia

Nitrogen molecules

Nitrogen Dioxide

Volcanic Eruptions

Blue green algae

Lightning

Bacteria in plant roots

Sun

Earthworm

tree

sheep

stays the same

increases

decreases