Three mian rocks

1.Magma is the heart of any igneous rock.

2. Some are billions of years old! Rocks come in many sizes.

3. Igneous means fire rocks.

1.tuff

2.diorite

3. nepheline

4.obsidian

5.basalt

1.After many years layers of these tiny pieces of rock pile on top of one another.

2.This type of rock is formed from igneous rocks that break down into smaller pieces and fall to the ground or to the bottom of a lake or river.

3. It means sitting rock.

1.chalk

2.claystone

3.coal

5.limestone

4.greywacke

1.Metamorphic means changed form

2. For example, limestone eventually can turn into marble.

3. That little pebble may be billions of years old.

1.serpentinite

2.phyllite

3.migmatite

4.quartzite

5.slate