Name two types of landforms formed by the action of sea waves
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delta ,valleys,water falls etc are the landforms
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(A) EROSION BY SEA WAVES :
· Sea waves have a great erosive force. · In their role of an erosional agent they perform four functions. · When the sea water loaded with rock fragments and sand attack the coastal rocks it is called abrasion.
(i) Sea Cliff · The maximum impact of the sea waves is observed on the lower part of the coastal rocks and consequently the lower part of the rocks is eroded more rapidly than the upper part. · This results in the formation of a hollow under the rock and with the passage of time this excavation in the lower part of the rock keeps on becoming larger. · The upper part of the rock is thus left projecting out towards the sea. · After sometime, this projecting part fall into the sea under its own weight. As a result a vertical wall is left. This vertical wall is called a cliff. · In India a number of sea cliffs are found along the Konkan Coast of India.
(ii) Sea Caves : · When the upper part of the coastal rock is hard and the lower part is soft, the erosion is not uniform. · The lower part of the rock in such circumstances is eroded much faster than the upper part. · Due to differential erosion a hollow is created in the lower part of the rock. · When the waves pound against this hollow, air present in the hollow gets compressed. · When the wave comes out of the hollow, the pressure on air is also released and it expands. · Due to continuous compression of the air in the hollow, the rocks are subjected to a great pressure and they break. · In this process, the hollows in the lower part of the rock keep on enlarging. · With passage of time they attain the form of caves and are known as sea caves.
(iii) Sea Arches : · When a part of coast extends to some distance into the sea, sea waves working from opposite directions cut a passage through the soft rocks. · In the initial stages, this passage is a narrow hole but it enlarges into a broad arch. · These broad doorlike features are called sea arches or natural bridges.
(iv) Sea Stacks : · When the roof of an arch is broken by erosion or under its own weight or due to any other reason a part of the original rock remains standing as a solitary mass. · It may be the rock forming the side of the arch. This type of a feature is called a seastack. · Sometimes they take the shape of islands but such islands are not permanent. · Small underwater stacks are known as stumps.
(B) Transportation by Sea Waves : · Sea waves, currents and tides are the main agents of transportation of eroded material in the coastal regions. · However, the role of waves is more important in connection with the formation of coastal relief features. · The material deposited on the coasts by the rivers and glaciers etc. is removed and transported by the waves.
Transportation by sea waves is carried out in two ways: (i) Removal and transportation, towards the sea, of the material deposited by river etc. on the coast. (ii) Carrying of material found in the sea to the coastal areas. During this process, the oceanic materials like pearls, conches and other shells are brought to the coast.
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Hope it helped u
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(A) EROSION BY SEA WAVES :
· Sea waves have a great erosive force. · In their role of an erosional agent they perform four functions. · When the sea water loaded with rock fragments and sand attack the coastal rocks it is called abrasion.
(i) Sea Cliff · The maximum impact of the sea waves is observed on the lower part of the coastal rocks and consequently the lower part of the rocks is eroded more rapidly than the upper part. · This results in the formation of a hollow under the rock and with the passage of time this excavation in the lower part of the rock keeps on becoming larger. · The upper part of the rock is thus left projecting out towards the sea. · After sometime, this projecting part fall into the sea under its own weight. As a result a vertical wall is left. This vertical wall is called a cliff. · In India a number of sea cliffs are found along the Konkan Coast of India.
(ii) Sea Caves : · When the upper part of the coastal rock is hard and the lower part is soft, the erosion is not uniform. · The lower part of the rock in such circumstances is eroded much faster than the upper part. · Due to differential erosion a hollow is created in the lower part of the rock. · When the waves pound against this hollow, air present in the hollow gets compressed. · When the wave comes out of the hollow, the pressure on air is also released and it expands. · Due to continuous compression of the air in the hollow, the rocks are subjected to a great pressure and they break. · In this process, the hollows in the lower part of the rock keep on enlarging. · With passage of time they attain the form of caves and are known as sea caves.
(iii) Sea Arches : · When a part of coast extends to some distance into the sea, sea waves working from opposite directions cut a passage through the soft rocks. · In the initial stages, this passage is a narrow hole but it enlarges into a broad arch. · These broad doorlike features are called sea arches or natural bridges.
(iv) Sea Stacks : · When the roof of an arch is broken by erosion or under its own weight or due to any other reason a part of the original rock remains standing as a solitary mass. · It may be the rock forming the side of the arch. This type of a feature is called a seastack. · Sometimes they take the shape of islands but such islands are not permanent. · Small underwater stacks are known as stumps.
(B) Transportation by Sea Waves : · Sea waves, currents and tides are the main agents of transportation of eroded material in the coastal regions. · However, the role of waves is more important in connection with the formation of coastal relief features. · The material deposited on the coasts by the rivers and glaciers etc. is removed and transported by the waves.
Transportation by sea waves is carried out in two ways: (i) Removal and transportation, towards the sea, of the material deposited by river etc. on the coast. (ii) Carrying of material found in the sea to the coastal areas. During this process, the oceanic materials like pearls, conches and other shells are brought to the coast.
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Hope it helped u
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