These are waterworn rocks such as boulders, cobbles and pebbles.
It's the main name for the finest grained clastic sedimentary rocks.
Table Mountain is a famous example of a sandstone outcrop.
Chert is a hard, fine-grained silica with an uneven, broken pattern.
Coal develops from peat that is formed from dead plants.
Limestone rock allows caves to form naturally or from excavations.
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