Weathering Rocks at the Earth's surface are subject to weathering by the chemical action of acid and alkali salts in rain and ground water.
(Weathering Rocks at the Earth's surface; are; subject to weathering by the chemical action of acid and alkali salts in rain and ground water)
Weathering Rocks at the Earth's surface
are
subject to weathering by the chemical action of acid and alkali salts in rain and ground water