Sedimentary Processes:
1) Weathering & erosion
2) Transport &
3) deposition
4) Lithification
Weathering: decomposition and disintegration of rock
Product of weathering is regolith or soil
Regolith or soil that is transported is called sediment
Movement of sediment is called erosion
Weathering Processes:
•Mechanical Weathering -
Disintegration of rock without change in chemical composition
•Chemical Weathering-
Decomposition of rock as the result of chemical attack. Chemical composition changes.
Mechanical Weathering:
•Frost wedging
•Alternate heating and cooling
•Decompression causes jointing
Chemical Weathering Processes:
•Hydrolysis - reaction with water (new minerals form)
•Oxidation - reaction with oxygen (rock rusts)
•Dissolution - rock is completely dissolved
Most chemical weathering processes are promoted by carbonic acid:
H2O +CO2 = H2CO3 (carbonic acid)
شامل 17 اسلاید powerpoint
دانلود پاورپوینت Minerals formed by weathering