This document provides an overview of weathering presented by Sharan R. It defines weathering as the disintegration or decomposition of rocks. There are three main types of weathering: physical, chemical, and biological. Physical weathering is caused by expansion and contraction from temperature changes and freezing water in rock cracks. Chemical weathering involves reactions with gases like oxygen and carbon dioxide. Biological weathering includes plant roots penetrating rocks and animal burrowing. Human activities like mining and quarrying also cause weathering. The presentation includes identifying examples of different weathering processes and preparing a poster on saving earth from mining.

1. WELCOME
PRESENTATION BY
SHARAN R
Roll No : 37
B.Ed Geography, 2018 -20
Emmanuel College of B.Ed Training, Vazhichal

2. WEATHERING
CHAPTER 1 - IN SEARCH OF EARTH'S SECRET

3. WEATHERING
Disintegration or Decomposition of rocks is known as Weathering.
• Disintegration : broken up into pieces.
• Decomposition : organic substances are broken down into simpler
organic matter.

4. TYPES OF WEATHERING
WEATHERING
Chemical
weathering
Physical / Mechanical
weathering
Biological
weathering

5. 1. Physical Weathering
• The expansion and contraction due to the variations in temperature.
• Disintegration by freezing of water in the fissures of rocks.
• It is also known as Mechanical weathering.

6. • Expansion and contraction due to
variations in temperature.
• Disintegration by freezing of
water in the fissures of rocks.

7. 2. Chemical Weathering
• Atmospheric gases like Oxygen, carbon dioxide, water, etc. react with the
minerals in the rock and result in the chemical decomposition of rocks.

8. 3. Biological weathering
• Plant roots penetrating into the fissures in rocks
• Burrowing of animals
• Decomposition of plant and animal remains lead to weathering.
• Human activities like : mining and quarrying lead to weathering.

9. ACTIVITY
• Identify the different weathering process ?
11
2 3 4

10. ANSWERS
1. Biological weathering (Human activity)
2. Chemical weathering
3. Biological weathering (plants)
4. Physical weathering

11. ACTIVITY
Prepare a poster on the
“ SAVE EARTH FROM MINING”

12. Questions
1. What is meant by Weathering ?
2. What are different types of weathering ?
3. Which weathering involves human activities like mining and
quarrying ?
4. Chemical weathering is formed due to the reactions of
_______, ______ , ________ ?
5. What are effects caused through mining activities.

13. HOME WORK….
Collect the details of weathering held in your locality.

14. THANK YOU