This document discusses rock weathering and soil formation. It states that rocks are composed of minerals and broken down through weathering processes like physical, chemical and biological weathering. Physical weathering is caused by temperature changes breaking rocks. Chemical weathering involves chemical reactions with water and oxygen that decompose rocks. Biological weathering occurs through plant and animal interactions like roots penetrating cracks in rocks. Weathering breaks rocks into smaller pieces and forms soil 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 leads to soil formation.
There are three types ,physical ,chemical
,biological weathering.
Topography ,climate , characteristic of rocks
etc .. Influence weathering .