- 1 decade agoFavorite Answer
1.The reason of landslide
Landslide is the downslide movement of rock and soil at a fast speed. Or you can say it is the rapid movement of large masses of loose rock and soil down a slope under the force of gravity.
It is a common hazard in Hong Kong. (About 300 landslide incidents every year.)
Occur if the slope is very steep (due to the pull of gravity.)
When soil saturated with water, soil particles are soaked with water and reduce the friction between the soil particles.
Rainwater increases the weigh of the soil on the slope and slide down...
Human cut down trees for wood, thus no roots to bind the soil.
They also cut the slopes in order to build houses and roads. Those make the slope unstable.
After an earthquake, landslide may occur.
Granite is the major type of rock in Hong Kong. There are many joints in this rock. These joints can break down by rainwater easily.
The climate is very hot and wet in Hong Kong. So weathering is very active. Rocks are weathered to produce a layer of weathered materials.
Expansion of urban areas to the steeper natural hill slopes. This refers to urban development.
Limited flatland makes the government needs to provide more space for buildings.
2009-12-30 15:24:00 補充：
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- 1 decade ago