Chapter 21: Movement of the Oceans

Study Notes

1• A current that forms _______ is called

a ________ current.– sandbars– longshore

2• A _____ ______ occurs where a _____

enters the ocean.– tidal– bore– river

3• A ______ _____ is a type of ____ ______.

– turbidity– current– deep– current

4• ______ have the effect of moving

______ on the ocean floor– Breakers– sediments

5• Calling a _____ a tidal wave is

misleading because a tsunami is not caused by tides– tsunami

6• _____ currents are caused by

differences in _________ of ocean water.– Deep– density

7• ______ evaporation and ___ ______ in

summer cause the Mediterranean Sea to have higher ______ and higher density– High– low– rainfall– salinity

8• _______ ____ grow larger because they

get more _____ form the wind– Larger– waves– energy

9• Most ocean locations have ___ ___

tides and ___ ____ tides daily because there are two tidal bulges– two– high– two– low

10• Motions in ocean water that occur as

____ _______ move around the ocean basins are called tidal _______.– tidal– bulges– oscillations

11• ____ tides occur when the gravity of

the sun and moon work ______ each other to create a _____ daily tidal range– Neap– against– small

12• One characteristic of the Antarctic

______ Water is high __________.– Bottom– density

13• Salinity does _____ control the

movement of _______ currents.– NOT– surface

14• _________ are formed by __________

currents– Sandbars– longshore

15• The ______ _______ causes gyres to

form– Coriolis– Effect

16• The curving of the path of ocean

currents and wind belts is called the ______ _____– Coriolis– Effect

17• The _______ in levels of ocean water

at high tide and low tide is called ___ _____.– difference– tidal– range

18• The factors that determine the size

of a wave are wind ______, ____, and the length of _____ the wind blows.– speed– fetch– time

19• The force that causes ____ is _______

– tides– gravity

20• The _______ point of a wave is its ____

– highest– crest

21• The major cause of _____ is the

gravitational pull of the _____ on the Earth and its waters.– tides– moon

22• The swift, _____ current that flows

northward along the east coast of the United States is called the ____ ______

• warm• Gulf Stream

23• The _____ ______ that flows toward

the ocean is called _____ ____.– tidal– current– ebb– tide

24• Tides that occur during the ___ ____

and the full moon, when the daily tidal ____ is greatest, are called ____ tides.– new– moon– range– spring

25• Two consecutive wave crests pass a

given point in one ______ ________.– wave– period.

26• Very ____ ____ are usually the result

of a _____ _____.– large– waves– long– fetch

27• Water ____ move in one complete

______ in a wave during a single wave period– particles– circle

28• Waves strike the coastline head-on

instead of at an angle as a result of ________.– refraction

29• When the tidal current flows _____

the coast, it is called a ____ _____.– toward– flood– tide

The End ??