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| 1 | |
The Oceans cover about 55% of the earth's surface. |
| | A) | True |
| | B) | False |
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| 2 | |
Of all the oceans, the Pacific has the deepest trench. |
| | A) | True |
| | B) | False |
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| 3 | |
The Pacific, Indian, and Atlantic Oceans are all connected around Antarctica by a body of water termed the Southern Ocean. |
| | A) | True |
| | B) | False |
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| 4 | |
The Arctic Ocean is a major basin that is cut off from all others. |
| | A) | True |
| | B) | False |
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| 5 | |
The Earth's innermost layer, or core, consists mainly of solid and liquid granite. |
| | A) | True |
| | B) | False |
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| 6 | |
Oceanic crust consists mainly of basalt and is denser than continental crust. |
| | A) | True |
| | B) | False |
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| 7 | |
Magnetic anomalies are bands of rock that run at right angles to the mid-ocean ridge system. |
| | A) | True |
| | B) | False |
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| 8 | |
The San Andreas Fault in California is an example of a spreading center. |
| | A) | True |
| | B) | False |
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| 9 | |
The Himalaya mountains formed from the collision of a seafloor and a continental plate. |
| | A) | True |
| | B) | False |
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| 10 | |
The Aleutian islands formed from the collision of two seafloor plates. |
| | A) | True |
| | B) | False |
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| 11 | |
In general, the seafloor crust is much older than the continental crust. |
| | A) | True |
| | B) | False |
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| 12 | |
Red clay is an example of a biogenous sediment. |
| | A) | True |
| | B) | False |
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| 13 | |
Most of the deep-sea sediments are gravel and sand because these heavier sediments roll down the continental slopes to the deep sea more easily than do silt or clay. |
| | A) | True |
| | B) | False |
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| 14 | |
Siliceous sediments are biogenous oozes formed mostly from shells of microscopic organisms. |
| | A) | True |
| | B) | False |
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| 15 | |
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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| 16 | |
Because they lack subduction zones, the east coasts of North and South America have more flat coastal plains than do the west coasts. |
| | A) | True |
| | B) | False |
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| 17 | |
In the Hawaiian island chain, the islands are older the farther west they are. |
| | A) | True |
| | B) | False |
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| 18 | |
Hot spots, which create volcanoes, are always found on spreading-center ridges. |
| | A) | True |
| | B) | False |
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| 19 | |
Guyots can be found on the Pacific deep-sea floor. |
| | A) | True |
| | B) | False |
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| 20 | |
Black smokers are chimney-like deposits formed when molten seafloor basalt emerged at a rift valley and cooled upon contacting seawater. |
| | A) | True |
| | B) | False |
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| 21 | |
Evidence for continental drift and plate tectonics includes |
| | A) | geological features in the Americas and in Asia that line up on opposite sides of the Pacific. |
| | B) | seafloor rocks that are older the farther they are from the crest of a mid-ocean ridge. |
| | C) | magnetic anomalies in stripes parallel to the continent's major mountain ranges. |
| | D) | both a and b. |
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| 22 | |
An example of a subduction zone is |
| | A) | the East Pacific Rise. |
| | B) | The San Andreas Fault. |
| | C) | the Mariana Trench. |
| | D) | the seafloor bordering eastern South America. |
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| 23 | |
The ancient ocean called Panthalassa became the ancestor of which ocean? |
| | A) | Atlantic |
| | B) | Pacific |
| | C) | Indian |
| | D) | Arctic |
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| 24 | |
The biologically richest part of the seafloor is |
| | A) | the continental shelf. |
| | B) | the continental slope. |
| | C) | deep-sea fans. |
| | D) | the abyssal plain. |
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