That's not the kind of rock that water erodes,' Whitby said.

The water had eroded the foundations of a number of buildings, and more rubble was in evidence.

The water then eroded the deposits to expose the layers as they are today.

Subterranean waters slowly eroded the earth around them until they were free.

Over the long term, the water is eroding the land.

The falls were formed when water eroded the mudstone.

Over time, the declining water eroded much of the land.

Ice and water eroded the looser rocks, while the harder ones in the mountain top have resisted erosion.

As the water eroded away, the glacial deposits the level in the lake dropped.

Or sometimes water erodes the lower stratae, and you get your caves that way.