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Earth hazards revision
Mass movement causes
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.
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.
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.