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1. Describe a BEACH that you would find on a passive margin coastline. 2. Describe a...

1. Describe a BEACH that you would find on a passive margin coastline.

2. Describe a BEACH that you would find on an active margin coastline.

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Expert Solution

A Beach is defined as , sediments that accumulate along the sea or lake shores. The configuration and contours of which depend on the action of coastal processes.The kinds of sediment involved and the rate of delivery of this sediment.There are three different kinds of beaches.

  • The first occurs as a sediment strip bordering a rocky or cliffy coast.
  • The outer margin of a plain of marine or fluvial accumulation.
  • Fairly peculiar character, consists of the narrow sediment barriers stretching for dozens or even hundreds of kilometres parallel to the general direction of the coast.

Certain sediment forelands, such as spits, points, and tombolos also occasionally are called beaches.

The upper limit of the active beach is the swash line reached by highest sea level during big storms. The lower beach margin is beneath the water surface and can be determined only if there is a definite border present between the sediment layer and the naked surface of the rocky bench.

If the sediment cover extends into deep water, the lowest beach margin may be defined as the line where the strongest waves no longer sort and move the sand. It occurs approximately at a depth equal to one-third the wavelength or 10 times the wave height.

The practical significance of beaches is not limited to their function as protectors of the coast or as recreation sites. On any sand beach there are thin layers of dark sand that can be seen. Some heavy minerals contain valuable metals, such as titanium, zirconium, germanium, tin, uranium, and gold.

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gladiator answered 1 year ago
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