erosion Flashcards
erosion
removal of sediments by wind, water, ice, gravity destructive
also produce landforms
deposition
constructive settling of sediments, build landforms
depend on?
climate, rock type, weather, topography
moving water
major force, streams, rivers, beaches, underground
stream
channel of sediments, erode and transport
river
larger stream, bring water from high to low places
waterfall
river/stream meets an area of rock that erodes and water flows over a vertical drop or series of steep drops
flood plain
flat, wide area of land along river, often covered when the river overflows during a flood
meanders
loop-like bend in the course of a river, more curved over time
oxbow lake
meander been cut off from sediments being deposited, damming up the ends
delta
sediment deposited where river flows into an ocean/lake builds up landforms
wind
Wind transports small particles, over great distances, even halfway across a continent/entire ocean basin.
wind erosion
wind-blown sand scours &polishes rock, carve into shapes.
wind deposition
when wind slows down it drops the sediments that was eroded at another location.
2 types of wind deposition
dunes, loess
dunes
沙丘
loess
form steep cliffs, silt and clay
mass wasting
downhill movement rocks/soil soaked by rain and pull of gravity
landslides
rapid downhill movement of soil, loose rocks, mud boulders
slump
sudden movement of large blocks of rock &soil down a slope. All moves together in chunks.
glacier
large mass of ice formed on land, moves slowly across surface; form in areas where snowfall greater than snowmelt
2 processes of glacier
Plucking occurs when a glacier flows over land, it picks up rocks/boulders dragging them across land, causing abrasions, gouges scratches in bedrock
another way
melt and put sediments down
