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Weathering, Erosion, and Depositioning

These three continuing processes are shaping and changing the world more everyday.

Pamela Comme

on 2 February 2014

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Transcript of Weathering, Erosion, and Depositioning

Weathering, Erosion, and Depositioning
What is weathering, erosion, and depositioning
The decomposition of earth rocks, soils and
their minerals through direct contact with the planet's atmosphere.

Process by which fragments are moved
by wind or water flow, and
then transported to other locations.

process by which sediments, soil, and
rocks are added to a landforms or landmass.
Its gradually wearing down the surface of Earth.

Before the rocks are eroded they are weathered.

There are 3 main types of erosion:
Coastal erosion, Glacial erosion, and Wind erosion.

It produces the soil from where Earths plants grow.

Human activities can also speed up erosion.

Sediments are brought to a new location.

Wind and water transport recently eroded sediment.

Factors that affect the rate of deposition are
particle size, shape, density, and velocity of transporting stream.

Deposition can refer to the buildup of sediment.

Smaller sediments are usually the first to settle.

Buildup of sediments is from organically derived matter.

Rock starts out solid, but over time
small bits of it break off, changing
the shape of the original rock.

Weathering is caused by water and chemical
reactions that loosen bonds holding rocks together.

Weathering can also decompose or decay rocks.

There are two types of weathering Mechanical and Chemical.
Chemical Weathering
Process by which rocks are decomposed, loosened
by chemical processes to form residual materials.

Chemical weathering tends to lower minerals density.

Chemical weathering is more common in locations
where there is a lot of water.

Types of Chemical Weathering:
Oxidation, Hydrolysis, Hydration, Carbonic acid action

Mechanical Weathering
Takes place when rocks are broken down
without any change in its chemical nature.

The main form of mechanical weathering is
frost shattering - frozen water expands in
the rocks and causes the rock to shatter.

Sudden temperature changes, salt wedging, and pressure
build up can also cause mechanical weathering.

Cause changes in the slopes and texture 
of rock structures, hills, and valleys.

Can cause landslides.

Causes buildings, statues, and roads to wear away.

Can wash soil, pollutants, and harmful sediment from the 
roads and farms into waterways.

Cause metals to oxidize (rust).

Reduce the area of a beach or shoreline.
Effects of weathering and erosion:
Depositioning Continued
The natural forces that move or erode
sediments are the same that deposit them.

Gravity acts as an agent of depositioning
when rocks fall or tumble downhill.

Deposition can positively affect human society
because of fertile soil, depositing silt transports.

Deposition creates beaches as sand deposits overtime.
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