Sandstone rocks are sedimentary rocks made from
small grains of the minerals quartz and feldspar. They often form in layers
as seen in this picture. They are often used as building stones. For
thousands, even millions of years, little pieces of our earth have been
eroded-broken down and worn away by wind and water. These little bits of our
earth are washed downstream where they settle to the bottom of the rivers,
lakes, and oceans. Layer after layer of eroded earth is deposited on top of
each. These layers are pressed down more and more through time, until the
bottom layers slowly turn into rock. |