Igneous rocks are rocks that are formed from the cooling of
underground magma or above ground lava. There are many different forms of
igneous rocks and below is an example of a few.
Granite
Pumice
Columnar Basalt
Metamorphic rocks are rocks that started out as igneous or
sedimentary and were transformed into another type of rock. This transformation
is caused by massive amounts of pressure and heat. Some examples of metamorphic
rocks are shown below.
Gneiss
Sedimentary rocks are formed when sediment deposits
accumulate and are pressed into rock formations. Sedimentary rocks can be
formed out of any type of rock that has been eroded. Some examples of
sedimentary rocks are shown below.
Limestone
There are many different naturally occurring minerals in the
world. These include quartz, fieldstone, hornblende, pyrite, halite, calcite,
and mica. Quartz is a particularly beautiful mineral. Its chemical formula is
SiO2. Quartz or silica
dioxide is commonly found all over the world. It is one of the most abundant
minerals. Here is a picture of quartz.
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