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WorksheetsUnit 8 - Ocean subsurface topography and motion
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
1. Currents in the deep ocean are driven by
a)
the wind
b)
Coriolis Effect
c)
seafloor earthquakes
d)
density differences
2.
Which will produce the highest waves?
a)
wind speed of 40 km/h
b)
wind speed of 20 km/h
c)
wind speed of 30 km/h
d)
wind speed of 10 km/hr
3.
The object most responsible for tides on Earth is
a)
the sun
b)
the moon
c)
ocean waves
d)
the stars
4.
If you were able to walk along the ocean bottom from a beach, which of the following features would you reach after the continental shelf?
a)
continental rise
b)
abyssal plain
c)
continental slope
d)
mid-ocean ridge
5.
What causes tides but NOT waves and currents?
a)
winds and the moon's gravity
b)
Mostly the moon's gravity
c)
Mostly the sun's gravity
d)
winds and temperature differences
6.
What is the MAIN cause of the Gulf Stream current?
a)
storms
b)
winds the blow now and then
c)
winds that blow in regular directions
d)
moon's gravity
7.
If the first high tide of the day occurs at 1:00 AM, the next high tide will come close to
a)
7:00 AM
b)
1:00 PM
c)
7:00PM
d)
1:00 AM the next day
8.
Which is most like a mountain chain?
a)
a seamont
b)
a guyot
c)
the abyssal plain
d)
the mid-ocean ridge
9.
Which of the following causes the density of seawater to increase?
a)
a decrease in temperature
b)
a decrease in salinity
c)
an increase in temperature
d)
a decrease in pressure
10.
Which ocean current moves perpendicular to the shore and sometimes carries swimmers out to sea?
a)
longshore current
b)
rip current
c)
swelling
d)
surface currents
11.
Which best puts the order of seafloor features in order from shore out?
a)
c. slope - c. shelf - c. rise - midcoean ridge
b)
c. rise - c. shelf - midocean ridge - c. slope
c)
c. shelf - c. slope - c. rise - mid ocean ridge
d)
midocean ridge - c. rise - c. shelf - c. slope
12.
On most ocean shorelines, the water rises slowly and covers the land twice a day. Then it slowly falls back. What is this movement called?
a)
current
b)
wave
c)
tide
d)
drift
13.
In which direction do most warm currents move?
a)
away from Earth's poles
b)
away from Earth's equator
c)
away from cold currents
d)
in the same direction as waves
14.
The energy of ocean waves comes mostly from
a)
the moon
b)
warm water rising
c)
movement of currents
d)
winds
15.
Describe the directional motion of water in waves.
a)
the water moves forward and backward
b)
the water moves side to side
c)
the water moves clockwise
d)
the water moves up and down
16.
Which offers the best description of high tide?
a)
high tides happen three times a day
b)
ocean water covers more of the shore
c)
the ocean is deeper
d)
more of the shore is exposed
17.
During what type of tide is the high tide the highest and the low tide the lowest?
a)
neap
b)
high
c)
gibbous
d)
spring
18.
Which of the following moon phases produces the least variation in tides on Earth?
a)
waxing gibbous
b)
first quarter
c)
waning crescent
d)
full moon
19.
What happens to the ocean as depth increases (you go deeper)?
a)
temperature stays the same
b)
pressure decreases
c)
temperature decreases and pressure increases
d)
temperature increases
20.
Slow-moving cold ocean currents may rise to the surface. This ___________ of cold water carries food particles to the surface, resulting in areas of good fishing.
a)
upwelling
b)
tide
c)
crest
d)
trough
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