Download GUIDED NOTES – IGNEOUS ROCKS Name Date

GUIDED NOTES – IGNEOUS ROCKS
Name _____________________ Date _________________
A. Origin of Igneous Rocks
•
_________________________ – Igneous rock formed from__________ that erupted onto the Earth’s
surface. (exterior – exit)
– Mineral _____________ are ______________ or ______ crystals are formed
– Examples: Basalt, Obsidian (volcanic glass)
•
______________________ – Igneous rock that formed when ___________________________
beneath the Earth’s surface. (interior – inside)
– Mineral_________________ that form are __________________
– Example: Granite
EXTRUSIVE ROCKS FORM IN TWO WAYS
1. _____________________: erupt and shoot out lava and ash.
2. _____________________: (FIH shurz), large cracks in Earth’s crust, can open up.
B. Texture of Igneous Rocks – How do they feel?

Depends on the _______________ and ____________ of the crystals

Large crystals – _________________-grained texture (rougher feel)
COOLED _________________

Small crystals – _______________-grained texture (smoother feel)
COOLED _________________
C. Mineral Composition of Igneous Rocks
•
Magma _________ in silica usually forms ____________________________________.
•
Magma __________ in silica usually forms ____________________________________.
D. Uses of Igneous Rocks
•
Tools and_____________________________ materials
– Hard, dense and durable
•
Ancient Egyptians used _____________________ to build statues.
•
Headstones
•
Basalt is crushed to make _______________________.
– The Vietnam memorial is made of black granite ( an igneous rock).
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