Exam 15: Waves Beaches and Coastal Erosion

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Grain size strongly controls the slope o...

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A) It erodes away and disappears.
B) It shifts seaward.
C) It shifts landward.
D) The wind picks up its sand to create dunes where the barrier island once was.
E) The impact of the sea level on a barrier island in negligible.

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A) The waves erode the sand below the boulders.
B) The boulders are washed out to sea by the waves.
C) The boulders protect the homes from the waves more or less permanently.
D) The waves push the boulders closer and closer to the homes.
E) The waves push the sand around the boulders inland to form dunes.

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East, Atla...

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A) The sand grains are finer near shore.
B) The bottom has to rise rapidly to merge with the sand of the barrier island.
C) Sand from the onshore part of the beach has to drop abruptly because offshore the sand is under water.
D) Waves in shallow water drag on the bottom, so they lose energy and need a steeper slope to move the sand.
E) The waves are bigger near shore.

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A) Non-native plants rarely survive in beach environments.
B) Non-native plants can require artificial watering, leading to a rise in the water table and gully formation.
C) Non-native plants can block the wind from moving the sand to and from the dunes.
D) Non-native plants can overtake the dunes, covering most of the sand, and require frequent cut-back.
E) Non-native plantings can change the soil acidity, making the sand more likely to blow away.

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