 |
 |
| |
|
Some
rocks are dramatically changed by forces inside the Earth. Extreme heat
or pressure underground can bake, squeeze, or fold rocks into something new.
Then they are called metamorphic rocks—metamorphic is Greek for "change
of form."
When sedimentary rocks like mudstone and siltstone are heated to very high temperature, new crystals can grow and may form a completely new rock called schist.
Do metamorphic rocks float? Let's find out!
This piece of schist sinks like a...well, like a stone! So our floating rock must have formed in a different way. Try again!
© The Children's Museum of Indianapolis, 2000
