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Ocean Currents Review

Total questions: 55

Worksheet time: 38mins

Name
Class
Date
1.
Ocean currents move energy in the form of
a)
Salt
b)
Water
c)
Heat
d)
Oxygen
2.

The Gulf stream (starting near the Equator) carries _____________ water from the east coast of The United States to the West coast of Europe.

a)

Cold

b)

Warm

c)

Fresh

3.

The apparent curving of moving objects from a straight path due to Earth's rotation is called the _____________ _________.

a)

Coriolis effect

b)

Ekman spiral

c)

Winds

d)

Thernohaline circulation

4.

Surface winds cause surface currents by

a)

the Coriolis effect

b)

transferring wind energy to ocean water

c)

wind absorbing energy from ocean water

d)

gravity

5.

Surface currents north of the equator flow clockwise, but surface currents south of the equator flow counterclockwise due to the Coriolis effect.

a)

True

b)

False

6.

A huge circular pattern of rotating ocean currents.

a)

whirlpool

b)

cyclone

c)

hurricane

d)

gyre

7.

The observation that moving ocean currents move at an angle from its wind source and continues to deflect as depth increases is called ...

a)

The Ekman spiral

b)

Thermohaline Circulation

c)

Eddy

d)

Coriolus effect

8.
Currents are deflected to the _________ in the Southern Hemisphere.
a)
right
b)
south
c)
left
d)
north
9.
What three factors work together to form a pattern of surface currents on Earth?
a)
weather, wind, sun
b)
global winds, the Coriolis effect, continental deflections
c)
global winds, the Coriolis effect, sun
d)
the Coriolis effect, continental deflections, the moon
10.

In temperate regions (like in FL), the ocean surface water is heated by the sun, causing some water molecules to evaporate. How would you expect this to affect the concentration of salt molecules?

a)

Increased concentration of salt

b)

Decreased concentration of salt

c)

No change in salt concentrations

d)

None of the above

11.

In temperate regions (like in FL), the concentration of salt ions is highest ...

a)

Deep in the water column

b)

Near the surface of the water

c)

In the middle of the water column

d)

None of the above

12.

In polar regions, the concentration of H2O (water) molecules is highest _____________.

a)

Deep in the water column

b)

Near the surface of the water

c)

In the middle of the water column

d)

None of the above

13.

Upwelling currents bring water to the surface that is ..... (You must choose the TWO correct answers)

a)

warm

b)

cold

c)

rich in nutrients

d)

rich in oxygen

14.

Which current shown on the globe is the Gulf Stream?

a)

Current A

b)

Current B

c)

Current C

d)

Current D

15.

Which of these is considered an equatorial current, driven by tradewinds?

a)

Current A

b)

Current B

c)

Current C

d)

Current D

16.

What causes the downwelling in the Northern Atlantic Ocean?

a)

strong winds from the Arctic Ocean

b)

salty water becoming very cold and dense in the Northern Atlantic

c)

extra strong tradewinds

d)

the delivery of warm water by the Gulf Stream

17.

The Ocean Conveyor Belt is also called thermohaline circulation because it is driven by

a)

winds

b)

Coriolis Effect

c)

differences in temperature and density

18.

Downwelling delivers water from the surface to the deep that is rich in ____________.

a)

fish

b)

nutrients

c)

oxygen

19.

There is more cloud formation and rainfall over _______________.

a)

cold water

b)

warm water

20.

Which of the following is true?

a)

Currents traveling from the equator carry a lot of heat energy towards the poles.

b)

Currents traveling from the equator carry a lot of nutrients towards the poles.

c)

Currents traveling from the equator carry a lot of oxygen towards the poles.

21.

The equatorial currents can be found

a)

in only the northern hemisphere

b)

in only the southern hemisphere

c)

in both hemispheres

22.

If coral reefs need warm water, on which coast of Australia would you expect to find the Great Barrier Reef, based on this map of ocean gyres?

a)

the east coast

b)

the west coast

23.

Along which coast would you expect a drier climate?

a)

The east coast of South America

b)

The west coast of South America

24.

When would you expect seabirds along the coast of Ecuador/Peru/Galapagos to have mass die-offs due to a lack of food (fish)?

a)

during a normal year

b)

during an El Nino year

c)

during a La Nina year

25.

During an El Nino year, the tradewinds

a)

are weaker

b)

are stronger

c)

don't change

26.

Which shows a year that California and Mexico might experience a little relief from their typical drought like conditions?

a)

Map A

b)

Map B

27.

Which shows a normal year in the Pacific Ocean?

a)

Map A

b)

Map B

28.

There are 5 large gyres in the worlds oceans. Which is NOT one of the major gyres?

a)

North Indian

b)

South Indian

c)

North Pacific

d)

South Pacific

e)

North Atlantic

29.
As you go deeper in the ocean, the water is colder and less salty.
a)
True
b)
False
30.

The California Current (west coast) carries _________ water from Canada.

a)

Cold 

b)

Warm

c)

Fresh

31.

Which type of water is MOST dense?

a)

cold

b)

warm

32.

Which type of water is MOST dense?

a)

fresh

b)

salt

33.

Which processes decrease salinity?

a)

freezing

b)

melting sea ice

c)

precipitation

d)

surface run off from land

e)

evaporation

34.

Identify the process(es) that REMOVE fresh water from the ocean.

a)

melting ice bergs

b)

evaporation

c)

freezing

d)

precipitation

e)

surface run off from land

35.

Which processes increase salinity?

a)

evaporation

b)

surface run off from land

c)

precipitation

d)

freezing

e)

melting

36.

two ice cubes were melted in a tray of fresh water. Why did the two cubes form layers?

a)

they were the same density

b)

they had different colors of dye

c)

they had different amounts of salt

d)

they were frozen for different lengths of time

37.

What term is used to describe the rapid change in temperature with depth?

a)

thermohaline circulation

b)

thermocline

c)

thermopolis

d)

temperature sink

38.

Compared to other regions at the same latitude, western Europe has a relatively warm climate. Explain.

a)

W. Europe sits on a thermoclime

b)

W. Europe is at a lower elevation than other countries

c)

W. Europe is heated by a current

d)

W. Europe is heated by nuclear power plants

39.

______ causes deep ocean currents

a)

The Coriolis Effect

b)

gravity

c)

wind

d)

density differences

40.
Comes from the words 'heat' and 'salt'
a)
thermohaline
b)
salinity
c)
density
d)
temperature
41.
As currents warm near the equator, the currents
a)
float
b)
circulate
c)
sink
d)
rise
42.

Glaciers melting leads to higher salinity.

a)

True

b)

False

43.
Where is ocean water the densest.
a)

The surface

b)

The middle

c)

The bottom

44.

When surface currents meet continents they ___?

a)

Stop moving

b)

Are deflected (change paths)

c)

Continue in the direction they were going

45.

When a large surface current has lost a lot of heat due to evaporation, it becomes more cool, ______&_____, so it sinks.

a)

less salty & more dense

b)

less salty & less dense

c)

more salty & less dense

d)

more salty and more dense

46.

________ and _______ affect the ocean's density and cause the Global Conveyor Belt to travel

a)

gravity and the Coriolis Effect

b)

temperature and salinity

c)

wind and climate

d)

temperature and the Coriolis Effect

47.

Based on the graph, which of the following statement(s) is(are) correct?

a)

Warm water sinks to the bottom of the ocean

b)

Warm water flows on the surface of the ocean

c)

Cold water flows in the deepest part of the ocean

d)

Cold water remains stationary in the deepest part of the ocean

48.

Along which coast would you expect the ocean to be high in nutrients, oxygen, and biodiversity?

a)

The east coast of South Africa

b)

The west coast of South Africa

49.

Along which coast would you expect the ocean to be low in nutrients, oxygen, and biodiversity?

a)

The east coast of North America

b)

The west coast of North America

50.

Which of the following is this image?

a)

El Nino Southern Oscillation

b)

La Nina

51.

Which of the following is this image?

a)

El Nino Southern Oscillation

b)

La Nina

52.

During El Nino, the high pressure system is over ____.

a)

Australia

b)

South America

c)

The ocean

53.

During La Nina, the high pressure system is over ____.

a)

Australia

b)

South America

c)

The ocean

54.

Trade winds blow east to west (Easterly) across the Pacific.

a)

When this is stronger, we have a La Nina event.

b)

When this is weaker, we have a La Nina event.

c)

When this is stronger, we have an El Nino event.

d)

When this is weaker, we have an El Nino event.

55.

Fisheries in South America:

a)

La Nina = booming due to greater deep water nutrient upwelling.

b)

La Nina = suppressed due to lower deep water nutrient upwelling.

c)

El Nino = booming due to greater deep water nutrient upwelling.

d)

El Nino = suppressed due to lower deep water nutrient upwelling.