why do land slide occur in hilly regions of india
Answers
Causes of Landslides
Natural
Earthquake- Seismic activities have always been a main cause of landslides throughout the world. Any time plate tectonics move the soil that covers them moves with it. When earthquakes occur on areas with steep slopes, many times the soil slips causing landslides. Furthermore, ashen debris flows caused by earthquakes can also trigger mass movement of soil.
Heavy Rainfall: When sloped areas become completely saturated by heavy rainfall many times landslides can occur. Without the aid of mechanical root support the soil simply runs off when it contains too much water.
Human causes
Clear Cutting: Method of timber harvesting which completely removes all old growth timber from the area. This method is hazardous because it destroys the existing mechanical root structure in the area and loosens the soil easily.
Mining: Mining operations that use blasting techniques often cause other areas that are at the risk of sliding to slide due to vibrations under the soil.
Answer:
Explanation:
The sliding down of a piece of land under the force of the gravitational pull of a mountain or hillside is called the landslide. It is a natural process which takes place in form of downward mass movements of rock, debris, and soil due to gravity influence. It is a most attention taking natural disaster which mostly existed in hilly areas but recently increased in frequency in certain areas because of human activity. Water from heavy rainfall and Excessive water are the frequent cause for landslides which weakens the slope materials.Other factors that weaken slope materials also contribute to the occurrence of landslides.