Theory question 103
Rocks and Soil Formation(a)(i) Define weathering. (ii) State two types of weathering.
(b) Discuss briefly four factors which influence weathering.
Show the model answer
Model answer
(a)(i) Weathering is the breakdown of rocks in place into smaller particles by physical, chemical and biological agents
(ii) Any two: physical (mechanical); chemical; biological
(b) Any four: temperature – heating and cooling crack rocks, heat speeds chemical reactions; water/rainfall – needed for chemical weathering (hydrolysis, hydration, solution), running water abrades; wind – carries sand that abrades rocks; living organisms – roots split rocks, organisms release acids; nature of the rock – hardness, mineral composition and joints; time; topography
Explanation
Define, two types, then four factors explained.