In arid regions where water is generally unavailable as a weathering force, temperature changes from day to night cause rocks to expand and contract, eventually cracking them into smaller and smaller particles.
(water; is; generally unavailable as a weathering force; L:arid regions) (rocks; to expand; ) (rocks; to contract; ) (temperature changes from day to night cause rocks to expand and contract; cracking; them; into smaller and smaller particles; L:In arid regions; T:eventually)
water rocks rocks temperature changes from day to night cause rocks to expand and contract
is to expand to contract cracking
generally unavailable as a weathering force L:arid regions
them into smaller and smaller particles L:In arid regions T:eventually