This document discusses three of Earth's external processes: weathering, mass wasting, and erosion. It defines weathering as the physical and chemical breakdown of rocks, which prepares the rocks for erosion. Weathering occurs through mechanical processes like frost wedging or chemical processes like oxidation. Mass wasting is the downward movement of rock and soil under gravity, often triggered by heavy rain or steep slopes. Erosion is the physical removal and transport of weathered material by forces like water, wind, or ice. These external processes continuously shape and resurface the land through the breakdown and movement of rock.

1. WEATHERING, SOIL, AND MASS WASTING 

2. DIFFERENCIATING EXTERNAL PROCESSES & INTERNAL PROCESSES External process- processes that occur at or near Earth’s surface and powered by the energy from the Sun Internal Process- processes that occur underneath the Earth’s surface and derives its energy from Earth’s interior

3. THREE EARTH’SEXTERNAL PROCESSES Weathering Mass Wasting Erosion

5. part of the rock cycle

6. considered as a preparation for erosion

8. AGENTS OF WEATHERING: change of the environment Water air/wind human activities chemical substances

9. KINDS OF WEATHERING Mechanical Weathering Chemical Weathering

11. increases the amt. of surface available for chemical weathering

13. d. Biological Activities- caused by an organism’s activity such as plants, burrowing animals & humans

14. FROST WEDGING ABRASION EXFOLIATION

15. CHEMICAL WEATHERING - rock is broken down by chemical action resulting in the change of the composition of the rock AGENTS: Oxygen 3. carbon dioxide Rainwater 4. acids produced by decaying organisms

16. 2 PROCESSES OF CHEMICAL WEATHERING Oxidation- mineral is interacted chemically by oxygen Hydration- mineral is interacted chemically by water Carbonation- mineral is interacted chemically by carbon dioxide or carbonic acid

17. BAUXITE- COMBINATION OF OXYGEN, HYDROGEN & ALUMINUM HEMATITE FORMED BY OXIDATION

19. transporting of the rock from one place to anotherAGENTS: Wind Water Ice

20. SHEET AND WIND EROSION Sheet erosion- soil is removed by thin sheets of water Wind erosion- caused by wind and only very significant during windy days or during a drought

22. RILLS AND GULLIES Rills- narrow incision of soil caused by overland flow Gully- landform created by running water which sharply eroded the land, typically on a hillside

23. G U L L Y R I L L S

26. MOTION TYPES OF MASS WASTING 1. fall- slopes which are too steep (ex. Rockfall) 2. Slides- materials remain fairly & coherent & moves along a well defined surface (ex. Landslide) 3. Flow- moves downslope as a vicious FLUID (ex. Mudflow) 4. Slump- downward sliding of a mass

27. A V A L A N C H E R O C K F A L L L A N D S L I D E

28. THE END 

29. BIBLOIGRAPHY: Tarbuck, Edward and Lutgens, Frederick. Earth Science: Basic Principles and Concepts, Pearson Education South Asia Pte Ltd. 23-25 First Lok Yang Road, Jurong Singapore http://www.regentsprep.org http://www.google.com http://images.google.com.ph/imghp?hl=en&tab=wi

30. THANKS FOR WATCHING! By: Russel Christine Corcino MSU-IIT IDS