What are Igneous Rocks?
from the cooling of hot
are called igneous rocks.
when the Earth cooled
its molten state about 4 billion years ago. Igneous rock is
still being made today by the process of tectonic activity.
How can Igneous Rocks be Identified?
randomly arranged interlocking crystals.
The crystal size depends on the rate of cooling.
When hot magma is cooled quickly it makes basalt
and when it is cooled slowly it makes granite.
Igneous rocks do not contain fossils because the rock forms
at a high temperature which would destroy any living organisms.
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