Recap 3 Coasts Flashcards
A crucial element of coastal management is understanding rates of erosion, or rates of recession. The latter term means how fast a coastline is moving inland. This is influenced by many factors. What is the key factor?
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Explain the erosion rate for the three major rock types.
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What exceptions are there to the general order of resistance to erosion?
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Many cliffed coastlines are not made of only one rock type. They are composite cliffs with different rock layers, possibly from different geological periods. What does this produce?
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Generally, what is the resistance of a cliff strongly influenced by?
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Cliff profiles can also be influenced by the permeability of strata. Outline the difference between permeable and impermeable.
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Why is permeability important?
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What protects many coastlines for the erosion of unconsolidated sediment?
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Explain how vegetation stabilises sediment.
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Many plants that grow in coastal environments are halophytes or xerophytes. Define each term.
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Why do only specially adapted plants grow by the coast?
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Why has maintaining and in some cases expanding, sand dune, salt marshes and mangrove become a key goal in coastal management?
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