Oceans Unit Exam

the surface water of the ocean is mixed by

• rain falling on it

• wind and waves

• fish swimming through it

the layer of water below the mixed layer is called

• the thermocline

• the unmixed layer

• the middle layer

the salinity of water is a measure of

• the temperature of the water

• the depth of the water

• the amount of salt and dissolved minerals in it

seamounts and guyots are examples of

• ocean ridges

• ocean trenches

• ocean volcanoes

materials that fall and collect on the ocean floor are called

• ocean sediment

• sea floor sludge

• ocean mud

rivers of water flowing through the ocean are called

• tides

• ocean currents

• migrations

diatoms and plankton are kinds of

• tiny marine plants and animals

• large spiny fish

• sea mammals

an echo can be used to

• tell the depth of the ocean floor

• tell a ship its location at night

• locate gold on the ocean floor

the deepest zone in the ocean is the

• bathyal zone

• abyssal zone

• splash zone

everything around an organism is called its

• environment

• home

• background