BIOLOGICAL WEATHERING

The decomposition of humus, produces organic acids which react with certain rocks. Which biological weathering process is this describing?

• Disintegration

• Decomposition

• Chelation

• oxidation

What is Biological Weathering?

• When animals and plants burrow/grow in cracks in rocks

• Weathering Caused by Freezing, Wind/Waves/Rain, Changes in temp

• Mineral composition of rocks change due to chemical reaction with water.

• Granular disintegration

Lichens, bacteria and mosses constantly live and feed on rock to

• Expand the rock strata

• Change the composition of the rock

• Alter the structure of the rock

Biological weathering occur more frequently in

• Hot and dry climate

• Cold and dry climate

• Hot and humid climate

• Cold climate

Many animals, such as these Piddock shells, bore into rocks for protection either by

• Producing chemicals that help break down the rock.

• Scraping away the grains or secreting acid to dissolve the rock.

• Finding moisture to grow gradually prize the rock apart.