GEOL 104 Lecture : GEOL 104 Lect14
Document Summary
The reaction of any substance with water. Hydrogen replaces one of the ions in the mineral. Results in dissolved ions and solid products. Occurs in poure water but is faster in acidic water. Bauxite is produced from silicates that undergo severe weathering. It is an ore mineral for aluminium. Chemical weathering attaches edges and corners first due to greater surface area and. Silicate minerals weather to clay minerals which absorb water and expand. This expansion causes concentric cracks whch expands and falls away, making the block smaller and smaller. Hence this is the process where angular blocks become rounder and smaller. This is a chemical process that occurs right where the rocks are, this does not happen in a stream or whatever. In this case, chemical weathering causes physical weathering physical weathering is identifiable because the rock expands and cracks. Slope - slower on gentle slopes, faster on steeper slopes.