EROSION.

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Presentation transcript:

EROSION

Erosion Activity 1: a) Using your computer, view the short film, “What is erosion?” Go to: Student Public Select: “ENH Year 8, Chisholm 2015 folder” Then: “Term 1, Landscapes and Landforms” Select: “Billy Blue Hair, “What is erosion?” b) Using this film as a resource, write a sentence which can answer the question, “What is erosion?”

Revision: Erosion of a headland What is a headland Revision: Erosion of a headland What is a headland? How does erosion change this headland?

Types of Coastal Erosion The sea shapes the coastal landscape. Coastal erosion is the wearing away and breaking up of rock along the coast. Destructive waves erode the coastline in a number of ways: Hydraulic action. Air may become trapped in joints and cracks on a cliff face. When a wave breaks, the trapped air is compressed which weakens the cliff and causes erosion. Abrasion. Bits of rock and sand in waves grind down cliff surfaces like sandpaper. Attrition. Waves smash rocks and pebbles on the shore into each other, and they break and become smoother. Solution. Acids contained in sea water will dissolve some types of rock such as chalk or limestone.

Coastal Erosion continued: There are several “types” of coastal erosion. Follow the link below and complete these activities: Activity 2: a) Write a definition for each of the types of erosion. ****You may use the previous slides to help you. b) Draw a picture of each of the types of erosion. Label the pictures. ****You will be able to source detailed images to help you from the link below. http://www.bbc.co.uk/schools/gcsebitesize/geography/coasts/coastal _processes_rev3.shtml

Using your own words, describe what has taken place in this diagram.

Bays The bands of soft rock, such as sand and clay, erode more quickly than those of more resistant rock, such as chalk. This leaves a section of land jutting out into the sea called a headland. The areas where the soft rock has eroded away, next to the headland, are called bays.

Coastal Erosion: How do you think that the bay was formed?

Headlands and Bays 1) describe a headland 2) describe a bay 3) List at least three differences between headlands and bays? 4) Draw a headland 5) Draw a bay

Erosion: How have these rock formations been “formed” by nature?

What do you think is meant by “longshore drift” What do you think is meant by “longshore drift”? What do you think is drifting? Can this add to erosion? How?

Describe this coast. Come up with three dot points that describe what you see… What may offer some protection to the land from erosion?

How many years do you think it would take to cause this type of erosion?