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Which of the following is not an erosional coastal landform?
- a)Capes and Bays
- b)Stack and Stumps
- c)Gloup and Geos
- d)Spits and Bars
Correct answer is option 'D'. Can you explain this answer?
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Which of the following is not an erosional coastal landform?a)Capes a...
Coastal Features of Deposition
- Beaches: Sands & gravel loosened from the land are moved by waves to be deposited along the shore as beaches. The eroded material is transported along the shore in several distinct ways. Long shore drifts which comes obliquely to the coast carries material along the shore in the direction of the dominant wind. At the same time, backwash removes part of the material seawards, along the bed of the sea, and deposits it on the off-shore terrace and even beyond. The constant action of the waves automatically sorts out the shoreline deposits in a graded manner. The coarser materials are dropped by the waves at the top of the beaches & the finer materials, carried down the beach by the backwash, are dropped closer to the sea.
- Spits & Bars:The debris eroded by waves is continually moved by long shore drift & where there is an indentation in the coast, such as at the mouth of the river or a bay, material may continue to be deposited across the inlet. As more materials are added, they will pile up into a ridge or embankment of shingle forming a spit, with one end attached to the land and other projecting into the sea. When a ridge of shingle is formed across the mouth of a river or the entrance to a bay, it is called a bar. Such a connecting bar that joins two land masses is known as Tombolo.
- Marine Dunes & Dune Belts: With the force of on-shore winds, a large amount of coastal sand is driven landwards forming extensive marine dunes that stretches into dune belts. Their advance inland may engulf farms, roads & even the entire villages. Hence to arrest the migration of dunes, sand binding species of grass & shrubs, such as marram grass & pines are planted. KB) Coastal Features of Erosion
- Capes & Bays: On exposed coasts, the continual action of waves on the rocks of varying resistance causes the coastline to be eroded irregularly. This is particularly pronounced where hard rocks occur in alternative band with softer rocks. The softer rocks are worn back into inlets or bays & the harder ones persist as headlands or capes. Even where the coastline consists of one rock type, irregularities will be caused by variation within the rock.
- Cliffs & Wave cut platforms: Generally, any steep rock platform adjoining the coast forms a cliff, whose rate of recession will depend on its geological structure i.e. the stratification & jointing of the rocks & their resistance to wave attack. If the bed dips seaward, large blocks of rock will be dislodged & fall into the sea & cliff will rise in a series of steps. On the other hand, if the beds dip landward, the cliff will be more resistant to wave erosion. At the base of the cliff the sea cuts a notch, which gradually undermines the cliff, so that it collapses. As the cliff recedes landwards under the pounding of waves, an eroded base is left behind called a wave cut platform. The platform, upper part of which is exposed at low tides, slopes gently seawards, with its surface strewn with rock debris from the receding cliff. Further the abrasion continues until the pebbles are swept away in the sea with eroded material deposited on off shore terrace.
- Cave, Arch, Stack & Stump: Prolonged waves attack on the base of the cliff & excavate holes in regions of local weakness called cave. When 2 caves approach each other from either side of headland & unite, they form an arch. Further erosion by waves will lead to total collapse of the arch. The seaward portion of the headland will remain as a pillar of rock known as stack. With the course of time, these stubborn stacks will gradually be eroded, leaving behind the stumps, which are only just visible above the sea level.
- Geos & Gloups (blow-holes): The occasional splashing of the waves against the roof of a cave may enlarge the joints when air is compressed & released repeatedly inside them. A natural shaft is thus formed which may eventually pierce through the surface. Waves breaking into the cave may force water or air out of this hole. Such a shaft is termed as Gloup or blow hole. The enlargement of blow-holes & continual action of waves weakens the cave roof. When the cave roof collapses, a long, narrow creek may develop known as Geos.
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Which of the following is not an erosional coastal landform?a)Capes a...
Explanation:
Erosional coastal landforms are created through the processes of erosion by waves, currents, and tides. These landforms typically have distinct features that are shaped by the erosive forces of the ocean.
Spits and Bars
- Spits and bars are depositional coastal landforms, not erosional.
- Spits are narrow ridges of sand that extend from the shore into the water, formed by sediment being carried by longshore drift.
- Bars are similar to spits but are submerged underwater and can be found parallel to the shore.
In contrast, erosional coastal landforms such as capes and bays, stack and stumps, gloup and geos are shaped by the erosion of the coastline by the sea. These landforms are typically characterized by their unique shapes and features that result from the wearing away of the land by the action of waves.
Erosional coastal landforms are created through the processes of erosion by waves, currents, and tides. These landforms typically have distinct features that are shaped by the erosive forces of the ocean.
Spits and Bars
- Spits and bars are depositional coastal landforms, not erosional.
- Spits are narrow ridges of sand that extend from the shore into the water, formed by sediment being carried by longshore drift.
- Bars are similar to spits but are submerged underwater and can be found parallel to the shore.
In contrast, erosional coastal landforms such as capes and bays, stack and stumps, gloup and geos are shaped by the erosion of the coastline by the sea. These landforms are typically characterized by their unique shapes and features that result from the wearing away of the land by the action of waves.
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Which of the following is not an erosional coastal landform?a)Capes and Baysb)Stack and Stumpsc)Gloup and Geosd)Spits and BarsCorrect answer is option 'D'. Can you explain this answer?
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