Plants-Week 9 Supplementary Notes
Plants provide physical support, a rooting medium, water and nutrients in solution, and are part
of the parent material.
Soils are described in terms of factors rather than processes, the five factors are biota,
topography, climate, parent material, and time.
Our focus is on processes to help us understand mechanisms of soil formation.
How mineral matter in soil is made
-parent material(consolidated bedrock or fragmented bedrock/glacial till) is broken down via
physical and chemical weathering
The purpose of physical weathering is to release minerals.
Physical weathering breaks down smaller rocks into larger rocks. It increases surface area.
Chemical weathering involves chemical rxns, it is the decomposition of rock involving chemical
alteration. It destroys primary minerals and produces secondary ones.
Physical weathering of limestone—when limestone is created, it is a mineral
Chemical weathering produces fine material in soil.
Some minerals are more resistant. Quartz is resistant. This has to do with its speed of
Why is quartz so resistant?
The molecules in qtz are held together very tightly due to strong bonds. There are no holes in