Quotation from: General Science

Written by: Bertha M. Clark


Rocks and minerals are not all equally soluble in water; some are so
little soluble that it is years before any change becomes apparent,
and the substances are said to be insoluble, yet in reality they are
slowly dissolving. Other rocks, like limestone, are so readily soluble
in water that from the small pores and cavities eaten out by the
water, there may develop in long centuries, caves and caverns (Fig.
30). Most rock, like granite, contains several substances, some of
which are readily soluble and others of which are not readily soluble;
in such rocks a peculiar appearance is presented, due to the rapid
disappearance of the soluble substance, and the persistence of the
more resistant substance (Fig. 31).

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