Glencoe Earth Science

Chapter 18: Ocean Motion

Standardized Test Practice

1
What accounts for 3.7% of the ions in seawater?

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A)calcium
B)chloride
C)magnesium
D)sodium
2
Which gases enters ocean water from organisms that photosynthesize?
A)carbon
B)nitrogen
C)hydrogen
D)oxygen
3
What describes the amount of dissolved salts in seawater?
A)density
B)buoyancy
C)salinity
D)temperature
4
The vertical ocean circulation that brings deep, cold water to the surface is called
A)upwelling.
B)a surface current.
C)a density current.
D)an ocean wave.
5
The highest point on a wave is called
A)a trough.
B)a crest.
C)the wavelength.
D)the wave height.
6
What is the direction of ocean currents in the northern hemisphere?

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A)north to south only
B)clockwise
C)east to west only
D)counterclockwise
7
After studying the figure above, what conclusion can you draw?

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A)The Atlantic Ocean is deep.
B)The oceans’ waters are constantly in motion.
C)The Gulf Stream flows east to west.
D)The oceans’ currents only flow in one direction.
8
Which of the following has an impact on surface currents?
A)upwellings
B)crests
C)the Coriolis effect
D)tides
9
What causes high and low tide?
A)the gravitational pull of Earth on the Moon
B)the gravitational pull of the other planets on Earth's water
C)the gravitational pull of the Moon and the Sun on Earth's water
D)the Coriolis effect
10
A higher than normal high tide is called
A)a spring tide.
B)a neap tide.
C)a breaker.
D)the tidal range.
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