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A coastal plain is formed when there is runoff from precipitation that flow back into the ocean and weathers and erodes the land near the coast. This usually happens on inactive plates. A lot of the East coast of the North American plate is a prime example. That is why as you get closer to the beach there is more and more sand because as you get closer to the ocean, the sediment gets smaller till it is sand.

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13y ago
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4mo ago

Coastal mountains are typically formed by tectonic plate movement. When two plates collide, one plate is forced upward, creating mountain ranges along the coast. This process can also involve erosion and sediment deposition, further shaping the coastal mountains over time.

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12y ago

When the sea waves crash into the cliff it creates cracks which after time will form a cave and the structure of the cliff will then be weak and the top of the will eventually collapse to form a 'stack' and after time that will for into a 'stump' which will then disappear.... so basicly by the sea waves

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9y ago

they formed as the juan de fuca plate began sinking under the North America plate.

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15y ago

By the waves, they eventually form a spit which is a bit like a bank but in a shape of how the waves formed it.

Then the spit gradually gets bigger which makes the Coastlines.

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Q: How are coastal mountains formed?
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