Weathering vs. Erosion Presentation in Minimalist Style.pptx

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1. GOOD DAY!

2. Lord God of all wisdom We pray for the La Consolacion University Philippines that she may be faithful to the purpose of our foundresess , continue to promote the search for the truth and knowledge and be an inspiration for others to follow. May we be a community of scholars sharing this ambition, caring for one another and loyal to the truth revealed to us as your disciples. AMEN.

3. CHECKING OF ATTENDANCE

4. Are you ready?

5. Explain how the products of weathering are carried away by erosion and deposited elsewhere Appreciate the impact of Earth's exogenic processes by reflecting on personal experiences and sharing insights in a group discussion. Students will collaboratively conduct a laboratory experiment to simulate and observe an exogenic process (e.g., erosion, weathering), and then analyze the results to demonstrate their understanding in a group report. objective

6. EXOGENIC PROCESS WEATHERING VS. EROSION VS. MASS WASTING

7. Have you ever wondered why mountains exist, or why rocks seem to change shape over time?

8. EXOGENIC PROCESS Exogenic processes are geological processes that occur on the Earth's surface due to external forces, primarily from the atmosphere, hydrosphere, and biosphere .

9. Exogenic processes Break down rocks E rode rock materials Transport them from high energy locations to low energy locations Relocation of rock by: Gravity Geomorphic Agents Flowing water, wind moving ice, waves

10. Weathering A natural process of breaking rocks into smaller pieces over time. Factors - Weather , chemical reactions, biological activities. Weathering Defined

11. Mechanical Weathering Physical breakdown (e.g., frost wedging). Chemical Weathering Chemical reactions changing composition (e.g., acid rain). Types of Weathering

12. Erosion Process transporting weathered material to new locations. Agents Wind , water, ice. Erosion Defined

13. Gravity-induced downslope movement of rock material that occurs without a geomorphic agent Rock falling High energy locations to low energy mass wasting Defined

14. Weathering breaks rocks, Erosion moves them. Weathering doesn't move materials, Erosion does. Weathering precedes Erosion. Weathering – Mass wasting- down slope movement of the weathered material by the aid of gravity. Differences Weathering vs. Erosion vs. mass wasting:

15. Process Definition Main Agent Weathering Breaking down rocks in place (physically or chemically) Water, air, organisms Erosion Transporting weathered materials from one location to another Water, wind, ice, gravity Mass Wasting Gravity-driven movement of large amounts of material down a slope Gravity

16. Weathering Physical weathering Disintegrates rocks breaking smaller fragments from a large block or outcrop of rock Chemical weathering Decomposes rock through chemical reactions that remove ions from the original rock.

17. Weathering Physical weathering Unloading Thermal expansion and Contraction Freeze-thaw

18. unloading High elevation helps drive this process Erosional stripping of overlying rocks, and ultimate removal of overlying weight REMOVAL OF ROCKS AT THE SURFACE

19. Thermal expansion and contraction Granular disintegration Differential thermal expansion and contraction of individual mineral grains in coarse crystalline rocks

20. Freeze-thaw Also called frost weathering or ice wedging Water freezes and expands 9% causing large pressure differences in the crack, widening it, leading to rock breaking off

21. Weathering Biological weathering is caused by the movements of plants and animals.

22. Weathering CHEMICAL WEATHERING breakdown of rocks and minerals through chemical reactions that alter their composition. Most important catalysts and reactive agents: Water Oxygen Carbon dioxide

23. Hydration Hydration in weathering is the process where minerals absorb water, leading to changes in their structure and volume. This can cause physical changes in the rock . A mineral expands when hydrated and shrink when dehydrated-Clay minerals Example – Cement combined with water

24. Water alone reacts with rocks Hydrolysis is like using water to break something down . Rainwater or groundwater can interact with the concrete in a bridge, leading to the hydrolysis of calcium silicate compounds. Hydrolysis Parthenon in Greece This process can weaken the concrete and necessitate repairs.

25. oxidation Chemical union of oxygen atoms with another substance to create a new product Yellowish stain on the rocks .

26. oxidation Rusting: When iron reacts with oxygen, it forms rust (iron oxide). This is a common example of oxidation . Burning : When a substance burns, it reacts with oxygen to release heat and light. This is also a form of oxidation . Corrosion : The gradual wearing away of metals due to chemical reactions with oxygen or other substances is called corrosion. Rusting: When iron reacts with oxygen, it forms rust (iron oxide). This is a common example of oxidation. Burning: When a substance burns, it reacts with oxygen to release heat and light. This is also a form of oxidation. Corrosion: The gradual wearing away of metals due to chemical reactions with oxygen or other substances is called corrosion.

27. Carbon dioxide and water molecules reacting with, and decomposing rocks Most effective on carbonate rocks (limestone) Solution and carbonation

28. WHAT IS THE MAIN DIFFERENCE OF PHYSICAL AND CHEMICAL WEATHERING?

29. Aspect Physical Weathering Chemical Weathering Main Process Breaking rocks into smaller pieces Changing the chemical composition of minerals Change in Composition No (same minerals, smaller size) Yes (minerals are transformed or dissolved) Causes Temperature changes and pressure Reactions with water, acids, oxygen Speed Often faster in cold or dry climates More active in warm, humid climates Common in Deserts, mountains, arid areas Humid tropical regions, caves, areas with acid rain

30. Earth's Surface Shaping Effects on Agriculture, Construction, and Environment Importance

31. Grand Canyon Formation (Erosion) Coastal Cliffs (Erosion) Desert Rocks (Weathering) Real-Life Examples

32. QUESTION???