The document discusses the three main types of weathering that cause rocks to break into small pieces. Mechanical weathering is caused by temperature changes that make rocks expand and contract, breaking them into layers. Chemical weathering results from chemical reactions between minerals in rocks and rainwater that cause disintegration. Biological weathering is the disintegration of rocks by tree roots and small creatures making homes in cracks.

1. WELCOME

2. Name : AJITHAMOL B. S.
Subject : Social Science
College : New B.Ed. College Nellimoodu
Candidate Code : 169/13376001

3. Topic
WETHERING

4. THE ROCKS BREAK INTO
SMALL PIECES IS CALLED
WEATHERING

5. WHETHERING IS MAINLY
3 TYPES
1.MECHANICAL WEATHERING
2. CHEMICAL WEATHERING
3. BIOLOGICAL WEATHERING

6. 1.MECHANICAL WEATHERING
Changes in temperature and the
freezing of the water in the cracks of
the rocks cause mechanical
weathering

7. Alternate expansion and contraction
causes the outer surface of the rocks
to break into layers. This kind of
peeling away of rock layer is called
EXFOLIATION

8. 2. CHEMICAL WEATHERING
When the rain falls on the rocks
chemical action takes place between
the minerals in the rocks and the rain
water. As a result of this there can be
disintegration of the rocks. This is
called chemical weathering.

9. 3. BIOLOGICAL WEATHERING
The roots of the trees penetrate into
the cracks of the roots and small
creatures make their homes in these
spaces. These also cause the
disintegration of rocks. This is called
biological weathering.

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