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geography (how is a spit formed (spit is formed, materials carried by…
geography
how is a spit formed
materials carried by alongshore drift
deposition occurs at a bend
materials build up
spit is formed
if deposition is carried on a bar is then formed
eroded materials get picked up
weathering types
chemical
biological
physical
weathering is the breakdown of rocks from different weather conditions.
mass movement
it happens when the force of the gravity acting on the slop is greater than the force
it is more likelt to happen when the material is full of water
is the shifting of rocks and loose material down a slop
types of mass movement
slides
slumps
wave cut platform steps
wave cut notch
rocks above the notch become unstable
waves cause erossion at the foot of a cliff
falls to leave a wave cut platform
abrasion
rocks scrape and rub again the bank wearing it away
attrition
rocks smash into each other into smaller sediments
hydraulic action
force of water breaks particles from the river bed
solution
water dissolves rocks
protection
sea wall-hard 500-1000 per meater
groynes-hard last up to 30-40 years
gabions-
rock armour-hard
dune fencing-soft
beach nourishment -soft looks natural
hard
soft
freeze thaw steps
water freezes and expands which puts pressure on the rock
when thraw is in contact it results in broken rocks
water gets in to rocks
waves
destructive
strong backwash but a weak swash .
very high waves
constructive
strong swash but a weak back wash .very small waves
formation of a sand dune
sea deposits sediments to form a beach
wind blows sediments in land
sand gathers around an object like dead animals
marram grass grows securing the sand in place
erosion is when rocks are broken down and carried away