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Igneous Rocks
Igneous Rocks are made from minerals melted deep inside the Earth
When these melted minerals cool they
form different kinds of Igneous rocks.
-When melted minerals are under the earth’s
crust they are called Magma.
-When melted minerals are above the earth’s
crust they are called Lava.
Pumice is an Igneous rock that is formed when air
bubbles are trapped in cooling lava above the
Earth’s crust.
Pumice is often called “Lava Rock.”
Obsidian is another type of Igneous rock that is
formed when lava, with no air bubbles, cools
QUICKLY above the Earth’s crust.
Obsidian is so hard and shiny, it is often called volcanic
glass. Native Americans used this type of Igneous rock
to form arrow and spear heads.
Other types of Igneous rocks are formed when melted minerals cool and
harden slowly under the Earth’s crust.
Basalt is an Igneous rock that is formed when magma
cools slowly above the earth’s crust.
-Granite is another Igneous rock that is formed when magma cools slowly
under the earth’s crust.
-Granite is often used in the construction of buildings, like for counter tops.
The different types of Igneous rocks we have learned about today
are:
Pumice
Obsidian
Basalt
Granite
So remember!
Igneous rocks are formed from molten
(melted) minerals that cool either
above or under the earth’s surface.
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