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Page 1: Chapter 19 Section 1 Review Page 474 - Wikispacessrms-earth-science.wikispaces.com/file/view/Chapter+19+Section+2... · Chapter 19 Section 2 Review Page 478 ... and the answer for

Chapter 19 Section 2 Review

Page 478 #’s 1-6

Directions: Write down the question and the answer for each question on a piece of paper to be included in your

Chapter 19 Notebook.

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1. Describe the three main sections of the continental margins.

• The continental shelf is the submerged part of the continent.

• The continental slope is the steep, seaward edge of the shelf.

• The continental rise is a raise wedge of sediment at the bottom of the slope.

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Continental Margin

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2. Describe where the boundary

between the ocean crust and the continental crust is located.

• The boundary is generally offshore at the base of the continental slope.

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Continental Slope

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3. Explain how turbidity currents are related to submarine canyons.

• Submarine canyons may form where large amounts of sediment tumble down a slope as part of a turbidity current.

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Turbidity Currents

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4. List four main features of the deep-ocean basins, and describe one characteristic of each feature.

• Trenches: very deep, formed by subduction

• Abyssal plains: vast, flat areas more than 4 km. deep and covered with a fine sediment

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4. (Continued)

•Mid-ocean ridges: form where plates move apart and have a narrow rift

• Seamounts: submerged volcanoes that may rise above the ocean to form volcanic islands

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Seafloor Features

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5. Compare seamounts, guyots, and atolls.

• A seamount is an underwater volcanic mountain.

• Guyots and atolls form from islands. When an island sinks and the top erodes flat you get a guyot. Before the island sinks completely an atoll may form around the sinking volcano in the shallow water.

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Seafloor Features

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Formation of an Atoll

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An atoll

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6. Explain the difference between the

meanings of the terms continental margin, continental shelf, continental slope, and continental rise.

• The continental margin is the name for all parts combined;

• the continental shelf, continental slope, and the continental rise.

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Continental Margin

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Image: Continental margin –California coast

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The End?