The document discusses the different types of weathering that affect rocks on Earth. It describes three main types of weathering: physical, chemical, and biological. Physical weathering breaks rocks through temperature changes and the growth of plant roots. Chemical weathering alters the chemical composition of rocks through reactions with water and oxygen. Biological weathering disintegrates rocks through the action of plant roots and burrowing animals. The weathering of rocks is an ongoing natural process that changes the surface of the Earth over time.

2.  Our earth is made up rocks.
 Rocks are composed minerals.
 Our earth itself is changing.
 I.e., rocks are getting changed.

3.  The process of disintegration and
decomposition of rock in generally called
weathering .

4.  Composition and structure of rock
 Nature of ground slope
 Climatic variations
 Floral effects

5.  Wind
 Glacier
 Running water
 Sea waves
 under ground water

6. 1. Physical weathering
2. Chemical weathering
3. Biological weathering

7.  Also known as mechanical weathering.
 It is caused by the change temperature.
 Due to expansion and contraction rocks break
up.

8. Physical weathering happen due to the process of,
 Changing of temperature
 Freezing action of water
 Roots growing plants which disintegrate rocks

10.  Decomposition and disintegration of rocks due
to chemical reaction.
 Water causing a change in the chemical
composition of rocks.

12. 1.Solution
 It is refers to the dissolution of soluble particles and
minerals from the rocks.
2.Oxidation
 It is a reaction of atmospheric oxygen to from oxides.
3.Carbonation
 It is a reaction of carbonate or bicarbonate ions with
minerals.
4.Hydration
 The process of hydration is related to the addition of water
to the minerals.

13. Oxidation

14.  The action of plants and animals leads to
breaking of rocks.
 Roots causing disintegration of rocks.
 The roots of the trees penetrate into the cracks
of the rocks.

16.  Burrowing animals
 Quarrying
 By human excreta

17. weathering is the physical disintegration and
decomposition of rocks. Physical weathering,
chemical weathering and Biological
weathering.