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WorksheetsExploring Earth's oceans
Total questions: 19
Worksheet time: 12mins
Name
Class
Date
1.
Which of the following is the base of the ocean food web?
a)
A. seal
b)
B. fish
c)
C. plankton
d)
D. shrimp
2.
How are estuaries connected to oceanic organisms?
a)
A. Estuaries provide sunlight for oceanic organisms.
b)
B. Estuaries provide primary food for oceanic organisms.
c)
C. Estuaries provide excess dissolved oxygen for oceanic organisms.
d)
D. . Estuaries provide a nursery grounds for oceanic organisms.
3.
Which will most likely result if there is increased upwelling in a coastal area?
a)
A. more aquatic life in the area
b)
B. more turbidity
c)
C. fewer nitrates
d)
D. higher water temperatures
4.
Which best explains why the water cycle mostly occurs over the oceans?
a)
Salt water evaporates more quickly than freshwater
b)
The temperatures over the oceans are warmer than over land.
c)
Most of Earth’s water is located in the oceans.
d)
The temperatures over the oceans are cooler than over land
5.
How would excessive increases in nitrate and phosphorous concentration affect freshwater systems?
a)
It would cause excessive algal blooms
b)
.It would cause increased dissolved oxygen.
c)
. It would cause increased water clarity.
d)
It would cause extremely cold water.
6.
Which explains why there are fewer marine organisms in the deeper zones of the ocean?
a)
amount of light decreases
b)
pollution increases
c)
salinity increases
d)
ph increases
7.
Which best describes organisms that live in the intertidal zone?
a)
they can all swim
b)
they are all fish
c)
. they can survive in both freshwater and saltwater
d)
They can survive in both air and water
8.
To which condition do all species in the ocean depths have to adapt?
a)
lower salinity
b)
extreme pressure
c)
swift pressure
d)
. hot water temperature
9.
As the temperature of the ocean increases, which most likely occurs?
a)
the level of dissolved oxygen decreases
b)
the rate of photosynthesis increases
c)
the amount of minerals decreases
d)
the level of dissolved nitrogen increases
10.
Why is sonar used for mapping the seafloor?
a)
it tells the speed of ocean currents
b)
it tells scientists the amount of sunlight per ocean zone
c)
. it tells scientist the temperature ocean water
d)
. it determines the depth of the ocean floor
11.
Which provides the largest source of dissolved oxygen in the ocean?
a)
hydrothermal vents
b)
algal growth
c)
tidal action
d)
coral reefs
12.
Which process allows cold ocean water, rich in nutrients, to rise to the surface?
a)
Photosynthesis
b)
desalination
c)
undertow
d)
. upwelling
13.
Which is most likely to be the energy source for organisms living in hydrothermal vents?
a)
oxygen
b)
sunlight
c)
methane
d)
carbon dioxide
14.
In which oceanic zone do clams and crabs survive by burrowing in the sand?
a)
oceanic
b)
intertidal
c)
neritic
d)
benthic
15.
Which best explains why estuaries are productive ecosystems?
a)
They have high saltwater content
b)
They have high levels of dissolved gases.
c)
They receive nutrients from both rivers and the ocean.
d)
They receive chemicals from commercial and industrial runoff.
16.
Which best describes the process of desalination?
a)
A. the process of adding chlorine to drinking water
b)
B. the process of removing salt from ocean water
c)
C. the mixing of saltwater and freshwater
d)
D. cold-nutrient rich water rising from deep ocean to the ocean’s surface.
17.
Bluefin tuna has become the most popular fish for sushi in Japan. Which is most likely the impact this has had on the species?
a)
Bluefin numbers are decreasing
b)
Bluefin numbers are increasing.
c)
All Bluefin are now raised on farms
d)
There has been no impact on the species.
18.
What does the U.S. Marine Protection, Research, and Sanctuaries Act do?
a)
It prohibits accidental oil spills.
b)
It prohibits dumping harmful materials into the ocean
c)
It puts lifeguards at every U.S. beach.
d)
It puts Congress in charge of trash dumping.
19.
Why is plastic trash dangerous to marine animals?
a)
Animals are not affected by plastic trash
b)
Plastic trash breaks down too quickly.
c)
Plastic trash is oily and sludgy.
d)
Animals can mistake it for food and choke on it.
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