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Oceans

Authored by TIMOTHY MOSER

Other Sciences

6th - 8th Grade

Used 173+ times

Oceans
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14 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why are Earth’s oceans salty?

Rain washed salts into them.

They contain a lot of water vapor.

Algal blooms in the ocean produced salt.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which description best characterizes the seafloor?

A. mostly flat

B. full of life-forms

C. similar to the continents

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Ocean waves move water

to form tides.

long distances.

in a circular motion.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Ocean surface currents are caused by

wind.

gravity.

density.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Density currents move ocean water

upward.

downward.

horizontally.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which situation describes a point-source ocean pollutant?

nitrates mixed in runoff

a nearby volcanic eruption

oil spills from several ships

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What causes coral bleaching?

slight changes in water temperature

an increase in carbon dioxide in the water

strong winds that blow for long periods of time

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