Oceans Question Preview (ID: 46170)
8.E.1.2.
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Which of the following is the main reason why the ocean is salty?
a) Surface water carries salt from land into the ocean.
b) Salts naturally form from water molecules in the ocean.
c) Salts are spilled by ships that sail through the ocean.
d) Salts dissolve from trash dumped into the ocean.
How are estuaries different from lakes or the ocean?
a) Estuaries contain only salt water.
b) Estuaries contain only freshwater
c) Estuaries contain both saltwater and freshwater.
d) Estuaries are not bodies of water.
Producers in the upper part of the ocean get nutrients from
a) Their roots, which grow in the ocean floor.
b) Materials brought to the surface by upwellings.
c) Dead organisms floating in the water
d) River water that washes out to the ocean.
Which region of the sea is affected by changes in the tides?
a) Open ocean
b) Deep ocean
c) Shore
d) Open ocean and shore.
Which are the main producers in the ocean?
a) Algae and other microscopic organisms.
b) Seaweed growing on the ocean floor.
c) Sea grasses growing on the ocean floor.
d) Microorganisms living near vents in the ocean floor.
Which of these is NOT a threat to living ocean resources?
a) Overfishing
b) Oil Spils
c) Evaporation
d) Pollution
What is the source of most of the salt in the ocean?
a) Human activities.
b) Rocks on land
c) Fish
d) Wind
How is the deep ocean floor different from the shallow parts of the ocean floor near land?
a) The deep ocean floor is flatter than the parts of the ocean floor near land.
b) The deep ocean floor is steeper that the parts of the ocean floor near land.
c) The deep ocean floor receives more light than shallower parts of the ocean.
d) All of these
What is an ocean basin?
a) A continuous body of water that covers up to 70% of Earths surface.
b) A deep trench along the floor of the ocean.
c) A part of the Earths surface covered by ocean water.
d) The layer of the ocean closest to the surface.
All of the following determine specific ocean zones except:
a) Sunlight
b) Temperature
c) Currents
d) Pressure
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