Flashcards in Sub Aerial Processes Deck (11):
What is a sub aerial weathering?
slowly breaks down a coastline, weakens the underlying rocks and allow sudden movements or erosion to happen more easily
What are the types of weathering?
What is mechanical/physical weathering?
in a climate which has temperature fluctuations above and below freezing(freeze thaw is common)
water enters the cracks,expands when frozen by 10% widening the rock, eventually breaking.
breaking down of rocks By action of vegetation and coastal organisms.
piddock have adapted shells that can drill into hard rock
occurs where rocks are exposed to air and moisture so chemical processes can breakdown the rocks
solution is the main chemical process
What is hydration?
makes rocks more susceptible to further chemical weathering ,although it involves the physical addition of water to minerals in rocks.
What is mass movement?
What are the factors?
lvl of cohesion within the sediment
height if the slope and slope angle
graim size withing the sediment
temp and lvls of saturation
Types of mass movement?
What are landslides?
cliffs made of soft rock slip as a result of failure within when lubricated, usually following heavy rainfall
occur from cliffs undercut by the sea or on slopes affected by mechanical weathering like frost action