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Rocks
Types of Rocks
Igneous Rocks
Metamorphic Rocks
Sedimentary Rocks
Igneous Rocks
What are They?
Fire Rocks
 Formed underground by trapped, cooled
magma or above ground when volcanoes
erupt and lava cools

Types of Igneous Rocks
Granite
Scoria
Pumice
Obsidian
Sedimentary Rocks
How They are Made
Particles of other rocks or the remains of
plants and animals are pressed and
cemented together
 Forms in layers below the surface

Types of Sedimentary Rocks
Sandstone
Limestone
Gypsum
Conglomerate
Shale
Metamorphic Rocks
What are They?
Existing Rocks are changed by pressure,
heat, or chemical reactions
 They were once igneous or sedimentary

Types of Metamorphic Rocks
Schist
Gneiss
Extrusive rocks- igneous rocks
formed from lava (ex: basalt)
Intrusive rocks- igneous rocks
formed from magma (ex: granite)
Lava/magma that is low in silica
forms dark colored rocks.
If it is high in silica, it forms light
colored rocks.
Rocks from Coral Reefs

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Coral reefs are
structures of
calcite skeletons
built up by coral
animals in
warm, shallow
ocean water.
When coral
animals die,
their skeletons
remain and more
corals build on
top of them.
The Rock Cycle

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Forces inside the Earth
and at the surface
produce a rock cycle
that builds, destroys
and changes the rocks
in the crust
Plate movements drive
the rock cycle