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2. Name : AJITHAMOL B. S.Subject : Social ScienceCollege : New B.Ed. College NellimooduCandidate Code : 169/13376001 3. TopicWETHERING 4. THE ROCKS BREAK INTOSMALL PIECES IS CALLEDWEATHERING 5. WHETHERING IS MAINLY3 TYPES1.MECHANICAL WEATHERING2. CHEMICAL WEATHERING3. BIOLOGICAL WEATHERING 6. 1.MECHANICAL WEATHERINGChanges in temperature and thefreezing of the water in the cracks ofthe rocks cause mechanicalweathering 7. Alternate expansion and contractioncauses the outer surface of the rocksto break into layers. This kind ofpeeling away of rock layer is calledEXFOLIATION 8. 2. CHEMICAL WEATHERINGWhen the rain falls on the rockschemical action takes place betweenthe minerals in the rocks and the rainwater. As a result of this there can bedisintegration of the rocks. This iscalled chemical weathering. 9. 3. BIOLOGICAL WEATHERINGThe roots of the trees penetrate intothe cracks of the roots and smallcreatures make their homes in thesespaces. These also cause thedisintegration of rocks. This is calledbiological weathering. 10. THANK YOU