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Weathering and erosion
This document discusses weathering and erosion processes. It defines weathering as the breaking down and dissolving of rocks and minerals at Earth's surface by various agents like water, ice, acids, plants and temperature changes. Erosion is defined as the transporting and movement of weathered rocks and minerals. The document provides examples of different types of weathering including mechanical, chemical and biological weathering. It also explains various agents and processes that cause weathering and erosion and how they shape the landscape over time.
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Weathering and erosion
- 1. WEATHERING AND EROSION JOHNEL V.ESPONILLA EARTH SCIENCE INSTRUCTOR N E S W
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- 13. WAVE ROCK Photograph by UliSchnakenberg
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- 16. WEATHERING • BREAKING DOWNOR DISSOLVING OF ROCKS AND MINERALS ON THE SURFACE OF THE EARTH.
- 17. WEATHERING • WATER, ICE,ACIDS, SALTS, PLANTS, ANIMALS AND CHANGES IN TEMPERATURE ARE ALL AGENTS
- 18. EROSION • TRANSPORTING OF ROCKSAND MINERALS AWAY.
- 19. WEATHERING AND EROSION • THESEPROCESSES CARVED LANDMARKS • CONSTANTLY CHANGE THE ROCKY LANDSCAPE OF EARTH 446 km long, 29 km wide, and 1,600 m deep
- 20. WEATHERING AND EROSION • Weatheringwears away exposed surfaces over time. • Vulnerability: Rocks beneath = less vulnerable Rocks exposed = more vulnerable
- 21. WEATHERING AND EROSION • Weatheringis the first step in the production of soils. • Fertility: Single type of weathered rock = infertile soil Collection of rocks = fertile soil
- 22. PROCESSES OF WEATHERING a. Mechanicalweathering b.Chemical weathering c. Biological weathering
- 23. MECHANICAL WEATHERING • a.k.a physicalweathering and disaggregation • Causes rocks to crumble • Agents: a. water c. wind b. gravity d. waves
- 24. MECHANICAL WEATHERING • FROST WEDGING/ CRYOFRACTURING • EXFOLIATION/SHEETING • HALOCLASTY/CRYSTAL GROWTH WEDGING • ROOT PENETRATION • ABRASION • GLACIAL WEATHERING
- 25. FROST WEDGING • Thefreezing and thawing of water in cracks.
- 26. MECHANICAL EXFOLIATION • The peelingoff of sheets of rock as they expand and crack.
- 27. CRYSTAL GROWTH WEDGING • Involvessalt crystals growing from salty waters
- 28. CRYSTAL GROWTH WEDGING • Involvessalt crystals growing from salty waters • Usually occurs near coastlines as it has on this granite.
- 29. ROOT PENETRATION • Involvessalt crystals growing from salty waters • Powerful plant grow into cracks and cause fractures.
- 30. ABRASION • Rock fragmentsbounce off each other. moon looking of an Antarctic rock
- 31. GLACIAL WEATHERING • Cause weatheringas ice and rock interact.
- 32. OTHER AGENTS • FLASHFLOODS • MUD SLIDES • LANDSLIDES • OTHER MASS WASTING
- 33. EROSION • Involves removaland transport • Rain, wind, and streams are all agents of erosion
- 34. LET’S CHECK IT OUT!!! Getout a piece of paper / science notebook and identify if the following involve WEATHERING, EROSION, BOTH, or NEITHER.
- 35. 1 •Waves are crashingon a sand beach. WEATHERING, EROSION, BOTH, NEITHER
- 36. 2 •Water expands asit freezes in the cracks of rocks. WEATHERING, EROSION, BOTH, NEITHER
- 37. 3 •Pebbles move downa stream with the current. WEATHERING, EROSION, BOTH, NEITHER
- 38. 4 •Acid rain causesthe decomposition of a statue in New York. WEATHERING, EROSION, BOTH, NEITHER
- 39. 5 •A man shovelsdirt to plant a tree. WEATHERING, EROSION, BOTH, NEITHER
- 40. 6 •A glacier slowlymoves down a mountain. WEATHERING, EROSION, BOTH, NEITHER
- 41. 7 •A tree’s rootsgrow into the cracks of rocks. WEATHERING, EROSION, BOTH, NEITHER
- 42. 8 •A major volcanoerupts. WEATHERING, EROSION, BOTH, NEITHER
- 43. 9 •A boy takesout the garbage for his mother. WEATHERING, EROSION, BOTH, NEITHER
- 44. 10 •A shovel isleft outside and begins to rust. WEATHERING, EROSION, BOTH, NEITHER
- 45. LET’S REPORT!!! 5 Groupswill be formed and gather information about chemical weathering and biological weathering
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