What is a notch landform?
A notch is a natural landform caused when the original rock is eroded where the sea level is. One way for it to be eroded is by waves from the sea crushing the rock, and wearing the softer parts away slowly (underneath the sea level, the water doesn’t have enough power to erode it).
How is a notch formed?
A wave-cut notch is formed by erosional processes such as abrasion and hydraulic action – this is a dent in the cliff usually at the level of high tide. As the notch increases in size, the cliff becomes unstable and collapses, leading to the retreat of the cliff face. The cliff continues to retreat.
What is a notch on a coast?
Coastal notches are indentations, usually ranging from a few centimetres up to several metres in height and depth, cut into the base of cliffs. Notches are usually absent from more moderately sloping cliffs that are dominated by subaerial weathering, surface runoff, and mass movement.
What are wave-cut notches and platforms?
Wave-cut platforms form when destructive waves hit against the cliff face, causing an undercut between the high and low water marks, mainly as a result of abrasion, corrosion and hydraulic action, creating a wave-cut notch. This notch then enlarges into a cave.
How are different coastal landforms created by erosion?
The most widespread landforms of erosional coasts are sea cliffs. Their vertical nature is the result of wave-induced erosion near sea level and the subsequent collapse of rocks at higher elevation. Cliffs that extend to the shoreline commonly have a notch cut into them where waves have battered the bedrock surface.
What is Longshore Drift diagram?
The transport of sand and pebbles along the coast is called longshore drift. The general direction of longshore drift is decided by the prevailing wind. In the diagram below the prevailing wind is approaching from the south-west. Therefore longshore drift is moving material from the west to the east.
How coastal landforms are formed?
The landforms that develop and persist along the coast are the result of a combination of processes acting upon the sediments and rocks present in the coastal zone. The most prominent of these processes involves waves and the currents that they generate, along with tides.
What is longshore drift diagram?
What are depositional landforms?
Depositional landforms are the visible evidence of processes that have deposited sediments or rocks after they were transported by flowing ice or water, wind or gravity. Examples include beaches, deltas, glacial moraines, sand dunes and salt domes.
Why are wave cut platforms flat?
This is usually the result of recent faulting or volcanic activity. Plunging cliffs are only slightly affected by wave erosion, therefore the formation of abrasion platforms is inhibited. At the base of most cliffs along a rocky coast one finds a flat surface at about the mid-tide elevation….
How does a wave-cut platform form quizlet?
A flat area of rock in front of a cliff created by cliff retreat. It forms after destructive waves hits against the cliff face, causing undercutting between the high and low water marks, mainly as a result of erosion.
What are 3 coastal landforms?
Landforms of coastal erosion 1) Headlands and Bays 2) Cliffs and Wave Cut Platforms 3) Caves, Arches, Stacks and Stumps Page 18 © Boardworks Ltd 2005 18 of 43 They are most likely found in areas of alternating resistant and less resistant rocks.
