Question

Which of the following is the best example of chemical weathering?

a Limestone rocks dissolving in water

b Plant roots growing through concrete and cracking it

c Waves carrying sand away from a beach

d A large rock splitting into pieces because of ice

Answer 1

A. Limestone rocks dissolving in water because dissolving is a chemical change

Answer 2

The answer is A because limestones are mostly calcium carbonate. When acidic rainwater falls on limestone a chemical reaction happens. These dissolve in the water, and then are washed away, weathering the rock.