weathering with example

weathering with example

1. Desert Geomorphology Weathering

2. Weathering What is weathering ? Different types of weathering . Examples .

3. Weathering “The breakdown and fragmentation of rocks into particles or units” What is weathering ?

4. Weathering Physical weathering Chemical weathering Biological weathering Different types of weathering .

5. “The chemical and physical weathering often go together and some time bio weathering too”

6. 1.Physical weathering No change in the rock’s chemical composition Granular disintegration: The disintegration of individual crystals or particles .

7. 1.1. Insolation weathering The breakdown of rock as a result of size changes “ thermal expansion and contraction”. They will create pressure build up inside rock .

8. (Examples) Exfoliation ( granite) The spalling off of thin sheets of rock . Uplift of region Exfoliation

9. 1.1.b Sheeting ( ls, ss ) a single layer of rock is broken off. The layer, or sheet, tends to break off of the rock in the same shape or form of the rock or graveston

10. 1.2 Frost weathering ( Frost Wedging) stress by freezing water increases .

11. 1.3 Salt weathering Involves: 1.3.a. precipitation of salt in voids 1.3.b. Crystallizing Salts in Cracks

12. 1.4. Organic activity ( Plant roots).

13. 2. Chemical weathering Chemical process ( decomposition) change in the rock’s chemical composition

14. 2.1. Solution or dissolution Minerals can be decomposed and involves water acting as a solvent (Qz). (Silicic acid) For example:

15. Hydration: absorb water (Hematite) (Hydrated iron oxide) (Anhydrite) (Gypsum) For example:

16. 1. Hydrolysis The replacement of metal cations by H+ ions and the combining of these cations with ions. For example:

17. Carbonization: For example:

18. 5.Oxidation and Reduction Processes of Chemical Weathering Oxidation Minerals may combine with oxygen to form new mineral s that are not as hard. For example, the iron-containing mineral pyrite forms a rusty-colored mineral called limonite For example:

19. Pyrite limonite

20. 6.Organic activity - (Desert varnish ) From biogenic processes. for Example: Bacteria oxidized Iron oxidizing bacteria

21. Thank you