4. Which of the following is the example of mechanical or physical weathering?
a. the action of acid in rocks c. the combination of oxygen with iron and other minerals in rocks
b. the growth of lichens on rocks d. the contraction and expansion of rocks due to temperature changes
5. How does temperature weather rocks?
a. the action of acid in rocks c. the combination of oxygen with iron and other minerals in rocks
b. the growth of lichens on rocks d. the contraction and expansion of rocks due to temperature changes
5. How does temperature weather rocks?
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Answer:
4. D.
5. Temperature changes can also contribute to mechanical weathering in a process called thermal stress. Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again, the structure of the rock weakens.
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