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Geography
Geography(The Sea)
Question | Answer |
---|---|
What are waves responsible for? | Erosion, transportation and deposition of material along our coasts |
How can waves occur? | When wind moves across the surface of the sea |
What is swash? | The forward movement a of a wave breaking onto the shore |
What is a backwash? | The backward movement of a wave breaking onto the shore |
What are constructive waves? | Waves that deposit more than they erode |
What are destructive waves? | Waves that erode more than they deposit |
Name the features of coastal erosion | Hydraulic action, compressed air,abrasion or corrosion,attrition and solution |
What is hydraulic action? | The force of water bashing against the coastline |
What is compressed air? | When air gets trapped in cracks or fissures in rocks |
Abrasion or corrosion? | When rocks,pebbles and stones are hurled against the coastline |
Attrition? | When rocks are in collision with each other |
Solution? | When rocks are dissolved by acids in the water e.g Limestone |
Name and explain a feature of coastal erosion | Bay and headland. Bays and headlands are formed as a result of compression and abrasion. Coastlines consist of areas of hard rock and soft rock. When waves hit against the rock the soft rock(bay) is eroded more quickly than the hard rock(headland) |
Example of bay | Dublin bay |
Example of headland | Dunmore Head, co. Kerry |
Name and explain a feature of coastal deposition | Beach. An area between the high tide and low tide mark. When waves break they are unable to carry material further and so deposit it. The swash is usually powerful and deposits larger materials up the beach. The backwash is less powerfull |
Give an example of a beach | Tramore, Co.Waterford |
Give two examples of human activity on the sea | Pollution, oil spillages and food,water |