Coastline Erosion 2

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Coastline Erosion 2

Marine arch

Marine Arches. Some narrow land area projects far into sea. It is known as Head Land. Sea caves develop on both the sides of the head-land by surfs. When the sea caves on either side meet each other, sea water passes across the passage formed by the joining of the sea caves. The arch over the passage is called natural bridge.

Stacks. When the roofs of sea arches or the natural bridges collapse the remains of natural bridge stand as pillars standing isolated and distant from one another. Such a pillar is known as Chimney Rocks or Skerry. Many pillars are also formed by solution action. Soft rocks are also eroded away by solution action from the adjoining hard rocks, with the result that hard rocks stand out as pillars.

Blow Holes (Spouting horns). If a hole is developed in the roof of a sea cave, it is known as blow hole or spouting horn. It is called Gloup in England. When these water enters the sea caves, the air of the cave is pressed up by the sea water and the air passes through the holes with a noise. Spouting horn is the name given because of the noise the blow holes made.

Hanging Valleys. If the rate of retreat of cliffs is faster than the rate of erosion of rivers flowing down the coast, the rivers appear to be hanging over the sea. These river valleys are called hanging valleys.

Plain of Marine Erosion. The sea waves erode the coast. The plain formed by erosion initially grows into a bigger one. It is known as plain of marine erosion.

Abrasion Platform. The base of the most violent stream is not more than 200 metres deep. If there is sediment for abrasion available at this depth, it is possible to have some erosion work. With the movement to and from motion of water in the wave the shingles and pebbles also move and cut the plain by corrosion. If the wave-built platform does not have a sudden fall below 183 meters in exterior portion, the platform formed by corrosion is called abrasion platform.

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