Question

Large rocks break into smaller particles due to changes in temperature because
(a) they expand when heated and contract when cooled.
(b) hot water will dissolve things better than cold water.
(c) they absorb all the sun's energy.
(d) water contracts when it freezes.

Answer 1

(a) they expand when heated and contract when cooled

Large rocks expand during day when sunlight falls on them and contract when cooled at night.
Therefore, repeated expansion and contraction due to change in temperature leads to their breakage.