Geography GCSE COASTS and RESTLESS EARTHWatch
Examine the importance of destructive waves in the formation of coastal
Destructive waves have a strong backwash but a weak swash, and henceforth have then power to cause erosion at a higher impact than constructive waves, the erosion it causes will lead to formations of coastal landforms.
Firstly, destructive waves can cause to a cliff to collapse, and the continuous destructive waves will lead to the collapsed debris, forming new land inland. The process starts when the wave power is more concentrated at the base of the cliff by cause of destructive waves, here abrasion occurs to form a wave cut-notch, the cliff overhangs above the notch. Since the overhanging cliff will become unstable, it will eventually collapse. The debris formed as a result will form new landscapes(?)
Destructive waves also our important in creating other coastal landforms, a large crack is opened by hydraulic action, the crack grows by hydraulic action and abrasion, thus the cave becoming larger. Over time, the cave will break through the headland to form an arch. As erosion contines the arch eventually collapses, this leaves a tall rock stack, the stack erodes due to the destructive waves to form a stump.
However, destructive waves are not only important in the formation of coastal landforms, the geology, also plays effect. For examples, soft rock structures such as clay are the least resistant and therefore erode the fastest. Adding on if the coast lies on a discordant coastline, then the layers of resistant sandstone and less resistant limestone are founds. Therefore it lets more easily waves to erode here to form bays, leaving the resistant sandstone as a headland.
I have to teach coasts to myself, some I am highly confused, and fore restless earth does anyone have any model 6 marks answers for guidance, I had to learn that one as well by myself, so I am confused on how marks are awarded
You need to discuss the importance more eg on caves, arches, stacks and stumps. But you clearly have a vast understanding on the main processes though.
To get full marks you needed to talk about at least 2 coastal formations
Writing four in less detail would not have been enough, they question is about examining so make sure you talk about what other things are important in the role of coastal formations.
Hope I helped clear things up for you