Review: Soil Erosion.

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Presentation transcript:

Review: Soil Erosion

Reasons for soil erosion – physical reasons human reasons Deforestation High winds cause the top soil to be removed Dry soil Using heavy machinery which compacts the earth so rain cannot be absorbed Too much farming - nutrients disappear (no humus) and soil is exhausted Heavy rain (sheet or gully erosion) Overgrazing land (cattle eating vegetation) Steep slope Ploughing the fields in the same direction

Finish in Class List 5 human causes of soil erosion using your textbook in your own words (pg.180-181) 2. For each cause, accompany with a small illustration or graph remind you HOW this causes soil erosion…

Desertification… the process by which productive land turns into a desert-like landscape, often through loss of top two productive layers of soil (soil erosion)… TOO MUCH SOIL EROSION… Turns into Desertification.

Almost half of the world’s earth surface is made up of drylands or arid regions Why are ARID regions at higher risk of desertification?

In Your Notebook, describe the pattern of areas at risk from desertification

Desertification: Sahel region of Africa The Sahel is the “zone of transition’ in Africa between the arid Sahara Desert to the north and the humid Savanna to the south.

Read p183 - 184 Case Study: the Sahel region Look on the web and name 4 countries located in the Sahel region of Africa. Read the pages above and answer the following questions: Describe the Sahel Region (flora, fauna, climate) Name three human causes of desertification Why is desertification happening in the Sahel? 3. Complete the graph on the following slide.

Review: What are human causes of desertification? Population growth (war, migration Overgrazing Overcultivation Deforestation Which happens first?

Task for Today – Battle Royale Read through 2 additional consequences of desertification in the Sahel region. For each, explain the consequences for: - Local people (in the Sahel countries worst hit) - The region (Sahel) or continent (Africa) - The Global Community (World)