Exogenic-Processes on earth and stuff concerning it.pptx

a pres. about exo processes

1. Exogenic Processes GROUP 2 – STEM 11 -B

2. After this presentation, learners are expected to: Identify the types of exogenic processes And of course, understand which is which sa weathering hehe

3. Exogenic Processes These include geological phenomenon and processes that originate EXTERNALLY to the Earth’s surface.

4. Mechanical weathering/Physical weathering It is the breakdown of rocks into pieces without any change in its composition. There are several factors.

5. Pressure Due to tectonic forces, granite may rise to form mountain range. After the granite ascends and cools, the overlying rocks and sediments may erode. At the point when the pressure diminishes, the rock expands, cools, and became brittle and fractured.

6. Pressure

7. Temperature Rocks expand and are fractured when expose to high temperature. However, if the temperature drops to 0°C (freezing point of water), it also expands and causes fracture.

8. Temperature

9. Frost w edging Generally, rocks have fracture in its surface and when water accumulates in the crack and at that point freezes, the ice expands and breaks the rock apart .

10. Frost w edging

11. Abrasion The breakdown of rocks is caused by impact and friction. This primarily occurs during collision of rocks, sand, and silt due to current or waves along a stream or seashore causing sharp edges and corners to wear off and become rounded.

12. Abrasion

13. Organic a ct ivity The roots grow causing penetration into the crack, expand, and in the long run, break the rock.

14. Organic a ct ivity

15. Human Activities Activities such as digging, quarrying, denuding forests and cultivating land contribute to physical weathering.

16. Human Activities

17. Burrowing animals Animals like rats, rabbits and squirrels excavate into the ground to create a space for habitation.

18. Burrowing animals

19. Chemical weathering It involves the interaction of rocks due to chemical reactions occurring between the minerals in rocks and the environment.

20. Dissolution It occurs in specific minerals which are dissolved in water. Examples of these minerals are Halite ( NaCl ) and Calcite (CaCO3). The formation of stalactites and stalagmites in caves are brought about by this chemical reaction .

21. Dissolution

22. Hydrolysis Rock-forming minerals like amphibole, pyroxene, and feldspar react with water and form different kinds of clay minerals.

23. Oxidation It is the response of oxygen with minerals . If the iron oxidizes, the mineral in rocks decomposes. Rusting is an example of this chemical reaction.

24. Oxidation

25. Erosion It is the separation and removal of weathered rocks due to different agents like water, wind, and glacier that causes transportation of the material to where they are deposited .

26. Erosion

27. Deposition This is the result of erosion. While erosion is when materials, like soil or rocks, are moved by wind or water (those materials are called sediments), d eposition is when those sediments are deposited, or dropped off, in a different location.

28. Erosion and Deposition

29. Mass wasting Also known as mass movement, is a general term for the movement of rock or soil down. Its driving force is gravity. There are many factors that contribute to mass wasting such as: Rock and Debris falls. Land Slides Flows However, humans also contribute to mass wasting through denudation of forests and quarrying.

30. Mass wasting

31. Transportation It is the movement of material across the Earth’s surface by water, wind, ice or gravity.

32. Transportation Solution Suspensi0n Traction Saltation

33. Conclusion! There are 2 types of exogenic processes. Degradation – Weathering, Mass wasting, Transportation, and Erosion and; Aggradation – Deposition.