Ocean Currents: Question Preview (ID: 27192)

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The California current flows _____________ along the coast of Calfornia carrying water towards the equator.
a) north
b) south
c) east
d) west

Southern California has cooler temperatures than Arizona, which is at the same latitude, but farther inland. What causes this temperature difference?
a) winds formed high in California's mountains
b) the shade provided by the large number of trees in California
c) a cold-water surface current off California's coast
d) a warm-water surface current off California's coast

Which currents carry warm water away from the equator?
a) deep currents
b) surface currents
c) evaporation
d) freezing

The Gulf Stream carries warm water to the North Atlantic Ocean, which contributes to
a) a harsh winter in the British Isles.
b) a cold-water surface current that flows to the British Isles.
c) a mild climate for the British Isles.
d) a warm-water surface current that flows along the coast of California.

Surface currents are caused by
a) floods.
b) warm water.
c) the wind.
d) the equator.

As water gets denser, how does it move?
a) expands toward warm water
b) sinks toward the ocean floor
c) gets pushed toward the poles
d) gets pulled up by evaporation

On a global level, ___________ water flows from the equator toward the poles on the surface and ____________ water flows back toward the equator on the bottom of the ocean.
a) cold, cold
b) cold, warm
c) warm, warm
d) warm, cold

What is the main cause of deep-ocean currents?
a) seafloor spreading
b) magnetic fields of Earth
c) volcanic island eruptions
d) water temperature differences

Where does the Gulf Stream begin?
a) poles
b) equator
c) floods
d) deep water

Cold water currents
a) move water from south of the equator back toward the equator
b) only rotate counter clockwise
c) flow along the equator
d) only flow west to east

How do warm water currents affect the coastal areas along which they flow?
a) They create create unusually cool climates for the latitude.
b) They create unusually warm climates for the latitude.
c) They create greater rainfall along the coast.
d) They make the coastal climate cooler than the inland climate.

Cold water currents are most likely to be located at deeper ocean depths than warm water currents because
a) cold water is more dense and sinks
b) cold water has less salt to help it freeze and sink.
c) ocean tides force cold water downward.
d) winds push cold water downward.

Deep currents form when
a) cold air decreases water density.
b) salinity increases.
c) warm air increases water density.
d) the ocean surface freezes and solids from the water underneath are removed.

Ocean currents flow from east to west near the
a) Gulf Stream.
b) global winds.
c) equator.
d) poles.

The density of ocean water increases when it
a) gets colder.
b) turns to ice.
c) joins the Gulf Stream.
d) gets warmer.

Compared with surface currents, deep currents are
a) warmer and denser.
b) warmer and less dense.
c) colder and denser.
d) colder and less dense.

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