This document discusses weathering and erosion. It defines weathering as the breakdown of rocks into smaller pieces through physical or chemical processes. Physical weathering breaks rocks down mechanically through processes like frost wedging or plant roots. Chemical weathering uses chemical agents like water, oxygen, carbon dioxide and acids to break rocks down chemically over time. One example of chemical weathering discussed is how carbon dioxide dissolves in water to form carbonic acid, which easily weathers limestone. The document also defines erosion as the movement of rock and soil by agents such as water, ice, wind or gravity. Specific types of erosion mentioned include water erosion through rivers/streams and runoff, ice erosion through glaciers, and wind erosion

1. Science 5
Facilitator:
Mr. Roland C. Dalloran Jr.
December 8-11, 2014

2. Weathering and Erosion

3. Weathering
• The breakdown do the materials of Earth’s
crust into smaller pieces.

4. Physical Weathering
• Process by which rocks are broken down
into smaller pieces by external conditions.
• Types of Physical weathering
– Frost heaving and Frost wedging
– Plant roots
– Friction and impact
– Burrowing of animals
– Temperature changes

5. Frost Wedging

6. Frost Heaving

7. Plant Roots

8. Friction and Repeated Impact

9. Burrowing of Animals

10. Temperature Changes

11. Chemical Weathering
• The process that breaks down rock
through chemical changes.
• The agents of chemical weathering
– Water
– Oxygen
– Carbon dioxide
– Living organisms
– Acid rain

12. Water
• Water weathers rock by dissolving it

13. Oxygen
• Iron combines with
oxygen in the
presence of water in
a process called
• The product of
oxidation is
oxidation

14. Carbon Dioxide
• CO2 dissolves in rain water and creates
carbonic acid
• Carbonic acid easily weathers limestone
and marble

15. Living Organisms
• Lichens that grow on rocks produce weak
acids that chemically weather rock

16. Acid Rain
• Compounds from burning coal, oil and gas
react chemically with water forming acids.
• Acid rain causes very rapid chemical
weathering

17. Karst Topography
• A type of landscape in rainy regions where
there is limestone near the surface,
characterized by caves, sinkholes, and
disappearing streams.
• Created by chemical weathering of
limestone

18. Features of Karst: Sinkholes

19. Features of Karst: Caves

20. Features of Karst: Disappearing
Streams

21. •

22. End of lesson for today

24. Learning Targets
I can:
-define erosion.
-enumerate the different agents of erosion.
-discuss how erosion happens.
-differentiate erosion from weathering

25. Erosion
• The process by which water, ice, wind or
gravity moves fragments of rock and soil.

26. Water Erosion
• Rivers, streams, and runoff

27. Ice Erosion
• Glaciers

28. Wind Erosion
Desert

29. Ilocos Sandunes

30. Mass Movements
• Landslides, mudslides, slump and creep
landslide clip.mpeg

31. Other agents of erosion
Animals:

32. Others agents of erosion
Humans: