Geology Chapter 20 MG – Flashcards
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If the wavelength of a set of waves is 20 feet long, how deep is the wave base?
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10 feet below the surface
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How shallow must the ocean floor be for waves to start to break for a wave set with a wavelength of 20 feet?
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Waves will break when the ocean floor is 10 feet below the surface
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What is the distance of a wavelength?
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Wavelengths are the distance between two crests.
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A set of waves are moving from east to west. Assuming the boat is in deep water, which of the following would describe the motion of a boat during the passage of these waves?
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The boat would move up and down in the water
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Which of the following statements describe what happens to sediment when a longshore current meets a jetty?
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Sediment is deposited on the up-current side of the jetty because water moves slower in this location. Sediment is eroded on the d own-current side of the jetty because water is starved of sediment in this location.
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Which of the following describes the general pattern of movement of the sand on a shoreline?
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Net sand movement is parallel to the shore.
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Which of the following coastal features is not a characteristic of a submergent coastline?
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Wave-cut platform
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Barrier Island has what feature?
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Depositional
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Sea Arch has what feature?
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Erosional
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The erosional retreat of a coastal cliff will lead to the enlargement of a _____.
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Wave-cut platform
