Karteikarten
Desertification
Karten in diesem Stapel (3)
- 1What is desertification?Desertification is the process by which environments beomce more like desert. Over a period of years, the amount of natural begetation decreases and the soil is exposed to the hot sun. when it rains, the rainwater runs over the surface of the soil, rather than soaking down into it, and the soil can be wahshed away. The soil becomes degraded or worn out. It's harder to grow crops and food shortages and water shortages may both become more commmon.
- 2The Sahal region and unpredictable patterns of rainfallRegions that have low rainfall totals each year are at most risk from desaertification.
The Sahel has a long dry season of nine months, followed by a wet season of raifnall for three months. The total amount of rainfall over these three months is similar to the total anmount of rainfall in Cambridge in a year. However, these wet seasons have become unpredictable, with short periods of heavy rainfall running off the land and failing to soak down into soil where it is needed to recharge the soil moisture and rock aquifers. - 3Seasonal rainfall patterns in the savannaThe regions that suffer from desertification are regions which have a tropical climate with a long dry season followed by a short rainy season. Suring the rainy season, rainfall is due to a combination of frontal and convectional rainfall. These regions naturally have a savanna ecosystem of grasses, shrubs and trees. The trees are scattered. They do not form a continous canopy like that of a tropical rainforest.However, the trees, shrubs and grasses all protect the soil from erosion. In regions where the trees and shrubs have been cut downor burnt, the process of desertification has been rapid. Therefore, it seems that the process of desertification is caused, at least in part by poor managment of the land.
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- Beschreibung
- GCSE Geography (Theme 2) Karteikarten am Desertification, erstellt von Samah Salih am 06/05/2017.
- Erstellt von
- Samah Salih
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- 12
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