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Metamorphic Rocks - Contact Metamorphism.

What is Contact Metamorphism?

The high temperatures needed to form metamorphic rock may
come about by contact of an existing rock with an igneous intrusion.

An igneous intrusion happens when magma is forced
through a crack in layers of rock in the Earth's crust.
The rock intrusion which is seen cutting across other rocks
must be younger (it has formed more recently).
Contact metamorphism is sometimes called baking.

Contact Metamorphism

How does Limestone become Marble?

Where the limestone has been in contact with hot magma the
high temperature has changed the crystal structure and limestone
has become marble (shown in the above picture as darker blue).
The magma has slowly solidified to become granite.

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