Chapter 14 section 1

Ocean Currents

S6E3d Explain the causes of waves, currents, and tides.

Surface currents are caused by

a. Floods

b. Warm water

c. The wind

d. The equator

Ocean currents in the Northern and Southern Hemispheres turn

a. From west to east

b. In opposite directions

c. Clockwise

d. Against the Earth’s rotation

Which process increases the salinity of ocean water?

a. The Coriolis effect

b. Convection currents

c. Evaporation

d. Continental deflection

Deep currents form when

a. Cold air decreases water density

b. Warm air increases water density

c. The ocean surface freezes and solids from the warmer underneath

d. Salinity increases

Compared with surface currents, deep currents are

a. Colder and less dense

b. Warmer and less dense

c. Warmer and denser

d. Colder and denser

Which phrase describes a surface current?

a. Gets cool near the equator

b. Flows like a stream

c. Stretches from north to south

d. Creates global winds

How does the Coriolis effect make ocean currents appear to move?

a. Back and forth

b. In a curved path

c. Clockwise

d. Against the Earth’s rotation

Which continent deflects the Gulf Stream Current?

a. North America

b. South America

c. Africa

d. Asia

What replaces a cold current that sinks to the ocean floor?

a. Colder deep current

b. A warmer surface current

c. A colder surface current

d. A slower surface current

What is the name of the ocean current that warms the British Isles?

a. La Nina

b. California Current

c. Gulf Stream

d. Equatorial Countercurrent

What is used by the NOAA to collect data to predict an El Nino?

a. Buoys

b. Satellites

c. California Current

d. Sonar

The movement of cold, nutrient-rich water to the surface of the ocean is called______.

a. warm-water currents

b. cold-water currents

c. stream

d. upwelling