The document discusses the weathering of rocks and soils. It notes that rocks are composed of minerals and broken down through various weathering processes, including physical, chemical and biological weathering. Physical weathering is caused by temperature changes breaking rocks. Chemical weathering involves chemical reactions with water that change the composition of rocks. Biological weathering occurs through the action of plants and animals interacting with rocks. Weathering leads to the formation of soil.

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 leads to soil formation.
 There are three types ,physical ,chemical
,biological weathering.
 Topography ,climate , characteristic of rocks
etc .. Influence weathering .