Wethering Process

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Earth-Venus Kinship

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iGCSE Geography

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Water on Earth

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Sound Waves

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Weathering, Erosion, and Deposition

Wind (9-6)

Types of wind deposites

sand dunes are when strong winds pick up sand and deposite them in dunes

loess is when the sand picks up soil and deposites it in airated piles

Types of wind erosion

abrasion when wind scrapes along rocks and can polish them(causes little erosion)

deflation when wind moves over loose material and leaves the heavier things behind

Erosion/deposition cycle(9-1)

Mass movement

mudflow

creep

slump

landslide

Cycle of erosion and deposition

erosion is the wearing down and moving of sediment from one place to another

deposition is where the forces of eroson deposite or lay down sediment

Waves (9-5)

Deposites by waves

Longshore drift

The process where sediment is moved down the beach with the current

Landforms created by erosion

Sea Arch where the wave has eroded through rock

Sea Stack where a sea arch has collapsed leaving a rock rising out of the ocean

Sea Stump where a sea stack has been aroded pasta certain point

sea cave where waves create an indentation in a cliff

Beach where sediment has been deposited

Erosion by waves

impact is when the wave crashes against the shore

direction change is when the sudden change in direction along the shore erodes the land

abrasion is when the wave picks up sand and erodes the shore like sandpaper

How waves form

waves form when air pressure pushes the particles back and forth and moves the energy forward

Wethering (8-1)

wethering and erosion

the removal of particles by wind, water, ice, or gravity

weathering is the wearing down of rock and sediment

mechanical wethering

The type of weathering in which rock is physically broken into smaller pieces.

Chemical wethering

The process that breaks down rock through chemical changes.

Rate at Wich Rock wethers

the rate at which rock weathers depends on the climate and what type of rock it is permeable will wear down easier impermeable takes longer to wear down.

Water erosion (9-2/9-3)

Erosion by Rivers

How water erodes

water erosion depends on ...

vegetation

water content of soil

porosity and permeability of the rock

the slope of the land

intensity of rainfall

Erosion and sediment load

most sediment come from runoff but can also come from the bottom and sides of the river as well as wind.

Ground water erosion

when the water level drops cavesw are left behind and eventually form cave formations

columns form whent he two meet

stalagmites form on the cave floor

stalagtites form at the top of the cave

when groundwater is acidic enough it will wear down the rock

Runoff and erosion

most sediment gets in the stream or river through runoff

abrasion is the wearing away of rock by grinding

Glaciers (9-4)

Glacial deposition

Whena glacier gets to the oceanit melts and deposites its sediment into various landforms

Process of glacial erosion

valley glaciers form at the tops if high mountians and move downward(creating moraines) and eventually melt into the ocean and eposite t he sedimen that they picked up along the way.

plucking is when the bottom of the glacier picks up stones and carves horrizontal lines in the bedrock

Types of Glaciers

valley glavciers form in valleys of mountains and and spread in one direction

continentel glaciers cover large islands or continents and spread out ward