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waves
ocean movement caused by wind

tides
the rise and fall of ocean water caused by the gravity of the moon.

currents
streams or rivers of water that flow continually through the ocean

gulf stream
a WARM ocean current that flows from the Gulf of Mexico, across the Atlantic Ocean (near Virginia) to Europe

salinity
A measure of the amount of salt in the ocean

density
the mass per unit volume of a substance (the amount of "stuff" in an area)
measuring if something "sinks" or "floats" in water.

causes of currents
wind
temperature changes
differences in salinity

motion
movement

waves, currents, tides
three basic motions of the ocean

gravity
A force that pulls objects toward each other.
The gravity of the moon pulls the ocean water and causes tides.

high tide
high level of water along the shore

low tide
low level of water along the shore
