When the molten earth cooled the landscape may have
looked a bit like this picture. The surface would have been rough
and uneven, with eruptions of lava. Rocks would be moving, floating
on the thick mineral soup beneath them. The rocks would crack
and break, colliding with each other as they cooled.
was life on earth, there were rocks and minerals. The crust of
the earth is made up of them. Today we see rocks and stones
and great rocky mountains when we look at the earth . These are
pieces of non-living, inorganic matter. However, there
are new kinds of rocks in the world now, rocks that have come
about because of geological processes. These processes break
rocks apart and then cement the tiny pieces of sand and silt
together again to make different kinds of rocks.
Geologists have divided rocks into three groups:
Igneous Rocks: formed by the cooling of molten material
Sedimentary Rocks: formed from tiny particles that are cemented together
formed from sedimentary
rocks by heat and pressure
Click on the rock types to learn more about
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