______ causes surface currents.

• The Coriolis Effect

• gravity

• density differences

• wind

______ causes deep ocean currents

• The Coriolis Effect

• gravity

• wind

• density differences

Decreasing ocean temperature causes the density of the water to ______.

• decrease

• increase

• stay the same

• fluctuate

As plants and animals in the ocean die, the nutrients produced from their decay _____.

• are recycled by the Global Conveyor Belt

• sink to the bottom

• are destroyed by sunlight

• become coral reefs

Nutrients are brought to the surface for phytoplankton to use at _______.

• gyres

• eddies

• upwellings

• the equator

_______ causes the Coriolis Effect

• Earth's rotation

• gravity

• wind

• density

The __________ is a surface current that flows along the eastern US and brings warm water to Europe.

• California Current

• Gulf Current

• North American Gyre

• Arctic Current

There are (is) _______ major gyres in each ocean.

• 1

• 2

• 3

• 4

Gyres in the southern hemisphere are surface currents that turn _________ due to the Coriolis Effect.

• clockwise

• counterclockwise

• toward the right

• toward the bottom of the ocean

_______ are the producers of Antarctic food webs.

• Zooplankton

• Phytoplankton

• Whales

• Upwellings