Radient Rocks and Minerals
Although it is often hidden under vegetation, soil, and water,
every inch of the Earth's surface is made up of rock. Rocks have formed
throughout the Earth's history. The oldest rocks date
back 3.9 billion years, almost to the beginning of the
Earth. New rocks are still forming. Rocks come in many
different sizes, shapes, and colors. They all have a
grainy texture because they are made from crystals
of naturally occurring chemicals called minerals.
There are 3 different types of rocks:
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