Exogenic process

Get into the study of physical geography, which includes exogenic geomorphic process.

Transcript

1. PHYSICAL GEOGRAPHY Exogenic geomorphic process
2. THE PROCESS OF WEARING AWAY THE EARTH CAUSES A GENERAL LOWERING AND LEVELING OUT OF THE SURFACE . IT IS KNOWN AS DENUDATION AND IS CARRIED OUT IN FOUR PHASES: weathering erosion transportation deposition
3. WEATHERING Weathering is mechanical disintegration and chemical decomposition of rocks through the action of various elements of weather and climate. The work of weathering is breaking up the rocks in of two kinds: chemical, physical or mechanical weathering , but the processes involved in each are closely interrelated.
4. PROCESS OF WEATHERING Chemical Weathering • Solution • Oxidation • Decomposition by organic acids Physical or mechanical weathering • Repeated temperature changes • Repeated drying and wetting • Frost action • Biotic factors Biological Weathering • None
5. EROSION When the massive rocks break into smaller fragments through weathering then erosion occur on them. The active wearing away of the earth’s surface by moving agents like running water , wind , ice and waves. These agents wear away the rocks and transport the eroded debris to lower land or right down to the sea.
6. DEPOSITION Deposition is a consequence of erosion. The erosion agents loose their velocity and energy. By deposition depressions are filled up. The dumping of the debris in certain parts of the earth, where it may accumulate to form new rocks.
7. AGENTS OF EROSION •Wind •Running water •Glaciers •Waves •Ground water
8. COASTAL LANDFORMS Coastal features of Erosion Coastal features of deposition Capes and byes Beaches Cliffs and wave-cut platforms Spits and bars Cave, arch, stark and stump Marine dumes and dune belts Geos and gloups
9. ARID OR DESERT LANDFORMS Wind deposition in deserts Wind erosion in deserts 1. Dunes • Barchan • Serifs or longitudinal dunes 2. Loess 1. Rock pedestals or mushroom rocks 2. Zeugen 3. Yardages 4. Mesas and buttes 5. Inselberg 6. Ventifacts or dreikanter 7. Deflation hollows
10. TRANSPORTATION The removal of the eroded debris to new positions.