chapter 19 section 1 review page 474 -...
TRANSCRIPT
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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?