made by lakshay ralhan of class 10..... contract us : lakshayralhan17@gmail.com for making any model

5. - A landslide or Landslip is
a geological phenomenon which
includes a wide range of ground
movement

6. HELP!!!!

8. Landslides occur when the
stability of a slope changes from a
stable to an unstable condition. A
change in the stability of a slope can
be caused by a number of factors,
acting together or alone. Natural
causes of landslides include:

9.  groundwater pressure acting to destabilize the slope.
 Loss or absence of vertical vegetative structure, soil
nutrients, and soil structure (e.g. after a wildfire).
 erosion of the toe of a slope by rivers or ocean waves.
 weakening of a slope through saturation by
snowmelt, glaciers melting, or heavy rains.
 earthquakes adding loads to barely stable slope.
 Earthquake-caused liquefaction destabilizing slopes.
 volcanic eruptions.

11. “Landslides are
aggravated by
human activities”

12.  deforestation, cultivation and construction, which
destabilize the already fragile slopes.
 vibrations from machinery or traffic.
 Blasting.
 earthwork which alters the shape of a slope, or which
imposes new loads on an existing slope
 in shallow soils, the removal of deep-
rooted vegetation that binds colluvium to bedrock.
 Construction, agricultural or forestry activities
(logging) which change the amount of water which
infiltrates the soil.

16. - Sand boils or Sand
Volcanoes occur when water under
pressure wells up through a bed of
sand. The water looks like it is "boiling"
up from the bed of sand

18. Sand boils can be a mechanism contributing
to levee failure during floods. This effect is
caused by a difference in pressure on two
sides of a levee or dike, most likely during a
flood. This process can result in piping,
whereby the removal of soil particles results in
a pipe through the embankment. The creation
of the pipe will quickly pick up pace and will
eventually result in failure of the embankment.

20. A sand boil is difficult to stop. The most
effective method is by creating a body of
water above the boil to create enough
pressure to slow the flow of water. A
slower flow will not be able to move soil
particles. The body of water is often
created with sandbags forming a ring
around the boil