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They are formed when lava and magma cools down and solidifies.
https://en.wikipedia.org/wiki/Igneous_rock

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andesite
basalt
dacite
dolerite /diabase
gabbro
diorite
peridotite
nepheline
Tuff
pumice
Obsidian

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1. There are about 700 different types of igneous rocks.

2. The igneous rock 'pumice' can float.

3. The up section of earth's crust is made up of around 95% of igneous rock.

4. Obsidian is a volcanic glass.

5. Obsidian can have sharp edges.

http://www.sciencekids.co.nz/sciencefacts/earth/igneousrocks.html

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Basalt

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Limestone

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Schist

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They are formed over time as layers mostly under water.
http://www.sciencekids.co.nz/sciencefacts/earth/sedimentaryrocks.html

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They are formed when they are near molten magma, but they do not melt they are just chemically changed
http://www.bbc.co.uk/bitesize/ks3/science/environment_earth_universe/rock_cycle/revision/5/

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Breccia
Conglomerate
Sandstone
Siltstone
Shale
Lime stone
Chert

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Gneiss
Phyletic
Schist
Slate
Marble

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1. Chalk is the soft and white form of limestone rock.

2. Sedimentary rocks give scientists clues about the earth's past.

3. You can find fossils in sedimentary rocks.

4. In swamps when plants die they don't decay but they become peat, and when the peat is compressed for over millions of year it turns into coal.

5. The mudstone cliffs in the southern coast of England have lot of fossils from the era of the dinosaurs.

http://easyscienceforkids.com/all-about-sedimentary-rocks/

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1. Lots of metamorphic rocks have layers the can be split apart.

2. Marble can be dissolved by lemon juice and other acids

3. Marble is a types of metamorphic rock made from limestone or chalk.

4. The 'Taj Mahal' in India is entirely made from marble {metamorphic rock}.

5. Most of the actual earth's crust is made from metamorphic rock.

https://www.coolkidfacts.com/metamorphic-rock-facts/

http://easyscienceforkids.com/all-about-metamorphic-rock/

# data[].attributes.body
andesite
basalt
dacite
dolerite /diabase
gabbro
diorite
peridotite
nepheline
Tuff
pumice
Obsidian