mass movement causes

HideShow resource information
Preview of mass movement causes

First 205 words of the document:

Earth hazards revision
Mass movement causes
Geological
Rock strength- more or less resistant rock e.g. granite or sandstone
Rock porosity- percentage of pore space in the rocks. The more porous the
more water that is held. This makes it heavier so it is more likely to move.
Rock structure- folding/faulting rocks have weak areas making them more
likely to move
Slope angle/angle of rest- higher angles has a higher influence of gravity
and higher chances of rocks moving.
Climate
Precipitation regime- amount/intensity of rainfall overtime. Saturated
ground=heavier ground causing collapse.
Water table/groundwater level- high water table lubricates soil increasing
chances of flow.
Rate/type of weathering/erosion- chemical, physical, biological
Temperature range- high temperature range causes freeze thaw weathering
Vegetation cover- binds soil, intercepts rainfall. Low vegetation leads to
mass movement due to lack of soil strength and wetter soil.
Human activity
Mining/tourism/farming- weaken land lead to mass movement. Mining
involves controlled explosions and tunnelling. Tourism erodes footpaths.
Farming involves run off from fields increasing erosion, raising the water
table and weathering.

Comments

No comments have yet been made

Similar Geography resources:

See all Geography resources »See all resources »