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1 | | About what percentage of the Earth's surface is covered by ocean? |
| | A) | 50% |
| | B) | 71% |
| | C) | 85% |
| | D) | 25% |
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2 | | Which is true? |
| | A) | The Pacific ocean is deepest and smallest |
| | B) | The Arctic ocean is shallowest and smallest |
| | C) | The Atlantic ocean is deepest and largest |
| | D) | The Indian ocean is shallowest and largest |
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3 | | Which is not true of the Pacific? |
| | A) | Its area is equal to that of the Indian Ocean. |
| | B) | It contains the deepest trench. |
| | C) | It is geologically the newest ocean. |
| | D) | It contains island arcs. |
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4 | | Alfred Wegener proposed which of these ideas? |
| | A) | All continents once were joined into one supercontinent. |
| | B) | Magnetic anomalies show that the sea floor did not form all at once. |
| | C) | The oceanic lithosphere is created by sea-floor spreading. |
| | D) | Sea levels dropped during the Ice Ages |
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5 | | Continental plates are believed to move because of which of these causes? |
| | A) | New volcanic rock pushes them away from spreading centers. |
| | B) | Cooling lithosphere becomes dense, sinks, and pulls a plate with it. |
| | C) | Plates crack along fault lines. |
| | D) | The mantle is fluid and carries plates along with it |
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6 | | What is the estimated pressure and temperature at the core? Remember that pressure is measured in atmospheres (atm). The surface of the earth is 1 atm. |
| | A) | 1,000 atm, 10,000°C |
| | B) | 10,000 atm, 8,000°C |
| | C) | 100,000 atm, 6,000°C |
| | D) | 1,000,000 atm, 4,000°C |
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7 | | The Earth's magnetic field is thought to be due to which of these? |
| | A) | Sea floor spreading |
| | B) | Movement of the crust |
| | C) | Currents carrying iron from the core to the crust |
| | D) | Movement of the outer core |
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8 | | Magnetic anomalies are bands of rock that run parallel to the mid-ocean ridge system. What do they provide evidence for? |
| | A) | Bacteria lived in the ocean floor millions of years ago |
| | B) | Volcanoes form at ocean ridges. |
| | C) | The sea floor was formed in stripes |
| | D) | Granite is denser than basalt |
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9 | | To find the oldest rocks in the ocean, where should you look? |
| | A) | At hydrothermal vents |
| | B) | Near trenches |
| | C) | On top of mid-ocean ridges |
| | D) | Near volcanoes |
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10 | | If you drop a camera at random to the deep-sea floor, you are likely to see which of these? |
| | A) | Steep ridges |
| | B) | Thick mineral deposits |
| | C) | Canyons |
| | D) | Lots of red clay |
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11 | | Siliceous sediments are biogenous oozes formed mostly from shells of microscopic organisms. |
| | A) | True |
| | B) | False |
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12 | | The biologically richest part of the seafloor is |
| | A) | The continental shelf. |
| | B) | The continental slope. |
| | C) | The plain. |
| | D) | Deep-sea fans. |
| | E) | The abyssal plain. |
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13 | | Sea levels were higher during the ice ages due to the large number of glaciers entering the oceans. |
| | A) | True |
| | B) | False |
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14 | | The Himalaya Mountains formed from the collision of a seafloor and a continental plate. |
| | A) | True |
| | B) | False |
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15 | | At the San Andreas Fault, which is happening? |
| | A) | Volcanoes are forming. |
| | B) | Two plates are colliding. |
| | C) | One plate is moving under another. |
| | D) | Two plates are sliding past each other. |
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16 | | The ancient ocean called Panthalassa is the ancestor of which ocean? |
| | A) | Atlantic |
| | B) | Pacific |
| | C) | Indian |
| | D) | Arctic |
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17 | | Which is true of the Tethys Sea? |
| | A) | It gave rise to the Arctic Ocean. |
| | B) | It formed between North and South America. |
| | C) | Today, it is located on the eastern coast of Asia. |
| | D) | It was home to may shallow-water organisms. |
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18 | | Which is true of seas? |
| | A) | They always are cut off from the main ocean basins. |
| | B) | They can contain the greatest average depths. |
| | C) | They form a continuous body of water around Antarctica. |
| | D) | They are shallower than the oceans. |
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19 | | Multibeam sonar can be used for which of these? |
| | A) | Studying chemistry of the Earth's core |
| | B) | Producing three-dimensional maps of continental margins |
| | C) | Producing maps of the positions of ancient continents |
| | D) | Predicting earthquakes |
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20 | | The Aleutian Islands formed from the collision of two seafloor plates. |
| | A) | True |
| | B) | False |
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21 | | To perform carbon dating on marine sediments, one generally needs which of these? |
| | A) | Microfossils |
| | B) | Nitrogenous sediments |
| | C) | Sulfide compounds |
| | D) | Siliceous ooze |
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22 | | Which of these features is not used as evidence of continental drift? |
| | A) | Similar rock formations on either side of oceans |
| | B) | Similar fossils on either side of oceans |
| | C) | Signs of rising sea levels |
| | D) | Bands of magnetic anomalies along mid-ocean ridges. |
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