Weathering & Erosion

This refer to the general

process whereby rock

disintegrate and decompose

at our near earth’s surface

(situ)

There are three main types of

weathering :

Physical weathering

Biological weathering

Chemical weathering

Sometimes called mechanical weathering,

physical weathering is the process that

breaks rocks apart without changing their chemical composition.

Freeze-thaw

action:

Temperature

changes:

Release of

pressure within Rocks:

Chemical weathering (also known as

decomposition or decay) is the

breakdown of rock (weathering) by

chemical mechanisms, the most

important ones being carbonation &

oxidation

Oxidation:

Carbonation:

Biological weathering is the weakening

and subsequent disintegration of rock by

plants and animals. Growing plant roots

can exert stress or pressure on rock.

Although the process is physical, the

pressure is exerted by a biological

process (i.e., growing roots).

Erosion refers to the removal of the weathered materials from the

areas where weathering of rocks

had taken place .

Flowing water:

Winds:

Sea waves:

There are how many types of weathering?

There are how many types of chemical

weathering?

Freeze and thaw action comes in which type of

weathering?

What is erosion?

How many types of erosion?

en.wikipedia.org/wiki/Weathering

imnh.isu.edu/digitalatlas/geo/basics/we

athrng.htm

en.wikipedia.org/wiki/Erosion

https://www.google.com.pk/search?q=

erosion&biw=1280&bih=687&source=lnm

s&tbm=isch&sa=X&ei=dZzcVJSOOoXPaM

O-gfgH&ved=0CAYQ_AUoAQ