Thursday, February 20, 2014

Metamorphic rock

There are three main types of rocks in our world.

We've learned about two types of rock now:
Igneous rock which is made from cooled lava.
Sedimentary rock which is made from water flowing over and leaving tiny pieces of dirt over thousands of years.

The third type of rock is metamorphic rock.
The word metamorphism means change in form.

These kinds of rocks are formed when two other rocks are squished together very hard for many many years.
Scientists can even look at the insides of the rock to figure out which types of rocks were squished together.

metamorphic rock
(from: wikipedia - metamorphic rock)

Kid Facts - Blast from the past: Voltage