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Rabu, 27 Januari 2010

Text Explanation

LANDSLIDES




Soil erosion is a geological event that occurs because of the fall of the movement of the ground like a big lump of rock or soil which is also a natural phenomenon that occurs in the mountains surrounding the area. The steeper the area, the greater the possibility of landslides. All the material on the slopes of the earth have a point where these materials will remain stable.

Landslide occurs when the top layer of earth and stones apart from the main part of the mountain or hill. This usually occurs because of high rainfall, earthquakes, or volcanic eruptions. In some cases, the exact cause is unknown. Landslides can occur because of natural faults and the weather on the soil and rocks. These cases are mainly in humid and hot climate like in Indonesia. When the landslide happens the top layer of the earth starts to slide freely on the slopes and take the momentum in this slide, so the launch will be faster (up to about 30 meters / second). A large volume of soil and mud slides is that damages homes, destroy buildings and sweeps man in seconds.

Although landslides are natural phenomena, some human activities could be a factor causing the landslide, when these activities resonate with vulnerability and natural conditions that have been mentioned. Examples of these human activities are haphazard felling trees on the slope area, quarry rocks, soil or other minerals which cause slope instability, pumping and draining groundwater that cause the decline of groundwater levels, changing the flow of canal water from its natural path, leakage in water pipe that changes structures (including the pressure in the soil) and the level of soil wetness and rocks, changing the slope of the area (such as the construction of roads), and excessive loading of the buildings in the hills.

The building that is located on the mountain slopes can be at risk of landslide disasters. If the landslide happens, the house can be hit by a big rocks or buried in soil on a large enough scale. As a result, the house and its contents are damaged. The disaster also claims the lives of human bias in that house who do not have time to escape.


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