When water seeps into a crack in a rock during warm weather and then freezed in cold weather , it expands.
(water; seeps; into a crack in a rock during warm weather) (it; expands; T:When water seeps into a crack in a rock during warm weather and then freezed in cold weather)
water it
seeps expands
into a crack in a rock during warm weather
T:When water seeps into a crack in a rock during warm weather and then freezed in cold weather