When can water wear away solid rock?

Water itself cannot wear away rock, but tiny particles of grit carried in the water can eventually wear away the hardest of rocks. It is this continuous wearing process that cuts valleys through mountains and hills. The faster the water flows, the more grit it carries, and consequently wears away at the rock to a greater extent. The same process can be seen along the coast. These rocks are worn away by the constant action of sand dashed against them by the waves.

Fact File:

When water seeps through the ground and reaches hot rock or volcanic gases, it boils violently this produce steam that can shoot the water out of cracks, causing a geyser.


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