This document discusses the different types of weathering. It defines weathering as the breaking down of rocks and other materials through contact with the atmosphere, water, and organisms. There are three main types of weathering: physical or mechanical weathering which causes disintegration without chemical change through processes like frost action and exfoliation; chemical weathering which alters the composition of rocks through reactions with water like oxidation and hydrolysis; and biological weathering where organisms release acids or penetrate rocks with roots to weather them. Common agents of weathering include water, ice, acids, salt, plants, animals, and temperature changes.

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ROLL NO: 25

2. What is weathering?
Weathering is the breaking down
of rocks, soil, and minerals as well as wood
and artificial materials through contact
with the Earth's atmosphere, waters, and
biological organisms.
Water, ice, acids, salt, plants, animals,
and changes in temperature are all agents
of weathering.

3. Classification of weathering
Weathering can be classified in three types
.these are-
1. Physical or mechanical
weathering .
2. Chemical weathering.
3. biological weathering.

4. Physical or mechanical weathering
Physical weathering, also called
mechanical weathering or disaggregation,
is the class of processes that causes the
disintegration of rocks without chemical
change.
Physical weathering can occur due to
temperature, pressure, frost etc.
 For example, cracks exploited by
physical weathering will increase the
surface area exposed to chemical action,
thus amplifying the rate of disintegration.

5. Block Disintegration
Exfoliation
(The breaking off
of curved sheets or
slabs parallel to a
rock surface due to
weathering.)

6. Granular Disintegration
Frost action
(rocks breaks as
water freezes in
cracks)

7. Chemical weathering
 Chemical weathering changes the
composition of rocks, often
transforming them when water
interacts with minerals to create various
chemical reactions.
. In this the processes
of oxidation and hydrolysis are most
important.

8. PROCESS OF CHEMICAL
WEATHERING:
Oxidation
Carbonation
Hydration
hydrolysis

9. Biological weathering
 A number of plants and animals
may create chemical weathering
through release of acidic
compounds, i.e. the effect of
moss growing on roofs is classed
as weathering.
 Mineral weathering can also be
initiated or accelerated by soil
microorganisms.
 Growing plant roots may
penetrate into rocks , widen
cracks and joints of the rocks
and split them apart.

10. REFERENCE:
 https://www.geolsoc.org.uk/ks3/gsl/education/resour
ces/rockcycle/page3461.html
 https://en.wikipedia.org/wiki/Weathering
 https://www.eartheclipse.com/geology/different-
types-of-weathering.html