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Amar Kumar 8 years, 4 months ago
Physical weathering is also called as mechanical weathering. This is the process where rocks breakdown without altering their chemical composition. Physical weathering can occur due to temperature, pressure or snow. There are two main types of physical weathering. They are freeze thaw and exfoliation.
Chemical weathering is the decomposition of rocks due to chemical reactions. This changes the composition of the rock. This often takes place when rain water reacts with minerals and rocks. Rain water is slightly acidic (due to dissolution of atmospheric carbon dioxide, carbonic acid is produced), and when the acidity increases chemical weathering also increases. With the global pollution, acid rains occur now, and this increases chemical weathering more than the natural rate.
Physical weathering does not change the chemical composition of the rock whereas chemical weathering changes the composition.
Physical weathering may result due to temperature, pressure, snow, etc. whereas chemical weathering mainly takes place due to rain.
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Sia ? 4 years, 8 months ago
Rapid Movement - involves a visible movement of material. Occurs very suddenly and rapidly. These types of movements can be very dangerous. Result in loss of life and property. Most occur on steep slopes and can involve rock, soil or debris.
Slow Movement - advances very slowly. Usually only noticeable by the effects of their movements. Responsible for the down-slope transport of a much greater volume of material since it is always occurring.
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Amar Kumar 8 years, 4 months ago
Terrestrial hazards: The hazards which originate inside the earth or its atmosphere are called terrestrial hazards.
E.g. Volcano, Earthquake
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Naveen Sharma 8 years, 4 months ago
The Loo is a strong, hot and dry summer afternoon wind from the west which blows over the western Indo-Gangetic Plain region of North India and Pakistan. It is especially strong in the months of May and June.
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