Science Quiz 8 Unit 3

Question 1

The Thermohaline circulation involves

temperature differences in the ocean

saline differences in the ocean.

dense cold, salty water and warm, lighter water.

a and b are correct

a, b, and c are correct

Question 2

The energy that drives surface ocean currents such as the Gulf Stream (and Florida Current and North Atlantic Current) comes from

the Coriolis effect.

the prevailing winds.

salinity variations.

density differences.

Question 3

Ocean currents in the Northern hemisphere spin to the ___________ due to the ______________ effect.

a) left trade winds

b) right; trade winds

c) left; coriolis

d) right; coriolis

Question 4

Saltwater is most dense at:

a) 4 degrees C

b) O degrees C

c) 32 degrees C

d) 98.7 degrees C

Question 5

Rainfall in the tropics _______________ the salinity of local ocean waters.

a) increases

b) decreases

c) has no effect on

d) saltwater 2

Question 6

Tides are created by the _______________ gravitational pull. The _______________ to/from the earth, the higher the tide.

a) moon's; closer

b) sun's; closer

c) sun's; farther

d) moon's; farther

Question 7

The movement of sand parallel to the shore:

is created by waves approaching at an oblique angle.

is achieved by longshore currents.

is an important reason for the construction of groins (barriers built at right angle to the beach for the purpose of trapping sand).

None of the choices are correct.

Question 8

Beach drift

is caused by obliquely breaking waves.

is the zigzag movement of sand grains along a beach.

is the debris deposited by waves high on the beach.

both (a) and (b) are correct

both (b) and (c) are correct

Question 9

Tides are generated by the gravitational pull of the sun.



Question 10

In an El Niño year:

the eastward flow of Pacific warm water weakens and the flow is reversed and warm water flows towards the Asia.

atmospheric pressure falls over Asia and rises over South America

equatorial trade winds strengthen, and warm water moves eastward toward South and Central America and California.

Coastal upwelling in the eastern Pacific (Western South America) dwindles or stops.

North and South America experience drought due to loss of moisture.