Chapter 14 The Ocean Floor

What percentage of Earth's surface is covered by water?

• a. 45 percent

• b. 51 percent

• c. 71 percent

• d. 85 percent

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Which of the world's oceans is the largest and deepest?

• a. Arctic Ocean

• b. Atlantic Ocean

• c. Indian Ocean

• d. Pacific Ocean

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Which of these features is NOT found on the ocean floor?

• a. mountain

• b. volcano

• c. river

• d. plain

What does sonar equipment measure?

• a. the density of the ocean's water

• b. the depth of the ocean floor

• c. the sound produced by bottom-dwelling ocean creatures

• d. the shape of the ocean surface

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Scientists use satellites to measure the

• a. ocean floor depth.

• b. size of underwater features.

• c. sea-surface height.

• d. ocean's salinity.

Which of the following areas is NOT one of the three main regions of the ocean floor?

• a. ocean floor basin

• b. continental margins.

• c. continental rock

• d. mid-ocean ridge

The continental margins of the Pacific Ocean are

• a. wider than those of the Atlantic and have more earthquake activity.

• b. narrower than those of the Atlantic and are not covered with thick layers of sediment.

• c. wider than those of the Atlantic and have no volcanic or earthquake activity.

• d. narrower than those of the Atlantic and are covered with thick layers of sediment.

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Trenches form at sites where

• a. one plate descends beneath another.

• b. erosion cuts into the continental shelf.

• c. two plates diverge under the sea.

• d. the tops of undersea volcanoes collapse.

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Abyssal plains are very flat features that form when

• a. volcanoes spread lava on the ocean bottom.

• b. turbidity currents deposit sediments on the ocean floor.

• c. ocean waters flood plains on land.

• d. plates diverge on the ocean floor, causing seafloor spreading.

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Which of the following forms at mid-ocean ridges?

• a. island arcs

• b. deep-sea trenches

• c. guyots

• d. new ocean floor

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