Consider the following statements:
1. Exposure of rock to the changes in temperature causes chemical weathering
2. Lichens and mosses are agents of physical as well as chemical weathering
Which among the above statements is / are correct?

Answer: [B] Only 2

Physical Weathering can be caused by thermal changes, Frost Action, Pressure Release, Hydraulic action and Haloclasty. Biological Weathering refers to the contribution made by the organisms such as Lichens and mosses, which grow on essentially bare rock surfaces and create a more humid chemical microenvironment. Biological weathering is both physical as well as chemical breakdown of the surface micro layer of the rock. The animals such as earthworms and other annelids, moles, rabbits all contribute to the biological weathering.

This question is a part of GKToday's Integrated IAS General Studies Module