1) Type of weathering cause by plants and other living organisms. a) physical b) biotic c) chemical 2) What happens when water gets into cracks in rocks and freezes?  a) They contract. b) They expand. c) They dissolve. 3) What type of weathering connected with rain affects monuments and statues made of limestone? a) physical b) biotic c) chemical 4) What causes rocks to expand and contract? a) wind b) running water c) changes in temperature 5) Wind is an agent of... a) physical weathering b) biotic weathering c) chemical weathering 6) When rocks rub against each other they get smoother. This is called... a) erosion b) abrasion c) frost

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