The Test on Earth's Waters consists of 18 questions. Correct answers will be provided after your answers have been submitted.
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1 | |
Of all the water that exists on the earth, the part available for human consumption and agriculture is |
| | A) | less than 1%. |
| | B) | about 3%. |
| | C) | about 80%. |
| | D) | nearly 98%. |
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2 | |
How many oceans exist on the earth's surface? |
| | A) | 7 |
| | B) | 3 |
| | C) | 1 |
| | D) | 5 |
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3 | |
The best source of extending today's supply of freshwater is |
| | A) | surface water. |
| | B) | recycling waste water. |
| | C) | groundwater. |
| | D) | the ocean |
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4 | |
What has happened to the average salinity of seawater since the ocean formed about 3 billion years ago? |
| | A) | major increase |
| | B) | slight increase |
| | C) | little change |
| | D) | major decline |
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5 | |
The chemical composition of seawater taken from oceans around the earth is found to |
| | A) | vary tremendously. |
| | B) | vary slightly. |
| | C) | uniformly not vary. |
| | D) | ...the answer is unknown. |
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6 | |
A given amount of seawater will have the greatest density if it has |
| | A) | no sediments, decreased salinity, increased temperature. |
| | B) | sediments, increased salinity, decreased temperature. |
| | C) | sediments, increased salinity, increased temperature. |
| | D) | no sediments, decreased salinity, decreased temperature. |
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7 | |
Waves always appear to approach the shore head-on because of |
| | A) | density differences. |
| | B) | reflection. |
| | C) | refraction. |
| | D) | rep currents. |
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8 | |
Breakers form when |
| | A) | the top of a wave overruns the bottom part. |
| | B) | waves enter shallow, then deeper water. |
| | C) | approaching waves hit the rip current. |
| | D) | the bottom surface is rippled. |
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9 | |
The largest waves are produced by winds that are |
| | A) | strong, blow for a long time, with a long fetch. |
| | B) | medium, blow for a long time, with a short fetch. |
| | C) | strong, blow for a short time, with a short fetch. |
| | D) | medium, blow for a short time, with a long fetch. |
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10 | |
Ocean waves will cause a particle floating near the surface to move |
| | A) | with the waves. |
| | B) | in circles. |
| | C) | up and down. |
| | D) | back and forth. |
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11 | |
The average salt concentration of seawater is |
| | A) | 3.5% |
| | B) | 35% |
| | C) | 0.35% |
| | D) | none of the above. |
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12 | |
Artesian water is water that |
| | A) | comes in plastic bottles. |
| | B) | is particularly pure. |
| | C) | has a better flavor than most water. |
| | D) | has been under pressure. |
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13 | |
The continental divide of the United States separates |
| | A) | Northern and Southern states. |
| | B) | The Atlantic Ocean and Pacific Ocean watersheds. |
| | C) | North America and South America. |
| | D) | North America into any two equal parts. |
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14 | |
On the average, how much precipitation becomes groundwater? |
| | A) | less than 1%. |
| | B) | about 15%. |
| | C) | about 70%. |
| | D) | almost 90%. |
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15 | |
Compared to the volume of all the surface water, the volume of all the ground water is about |
| | A) | 10 times more. |
| | B) | 20 times less. |
| | C) | 30 times greater. |
| | D) | the same. |
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16 | |
The ocean current flowing between the Mediterranean and the Atlantic Ocean is a result of |
| | A) | salinity differences. |
| | B) | temperature differences. |
| | C) | suspended sediments. |
| | D) | none of the above. |
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17 | |
The continental shelf is a part of the |
| | A) | seamount ridge. |
| | B) | ocean basin. |
| | C) | continental slope. |
| | D) | continent. |
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18 | |
Of the following features of the ocean the deepest part is the |
| | A) | submarine canyon. |
| | B) | continental shelf. |
| | C) | continental slope. |
| | D) | ocean basin. |
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