Transcript II. Igneous Rocks

Subject
II. Igneous Rocks
Mr. Mathews’ Earth Science 6th Grade
Main Idea
A. Classification of
Igneous Rock
Details
• Classified according
to their _______
(where they formed),
• ______ (how they feel
in terms of grain size,
shape, and pattern),
• mineral _________
(the minerals that
make up the rock).
Main Idea
1. Origin (where they
form)
Details
a. Extrusive Rock
-forms from ____ that
has exited the volcano
or earth’s crust
Example: Basalt –
most common
extrusive, forms most
of crust beneath
ocean floor.
Main Idea
1. Origin (where they
form)
Details
b. Intrusive Rock
- forms when ______
cools and hardens
inside the Earth.
Example: Granite –
most abundant
intrusive, forms most
of continental crust.
Main Idea
2. Texture
Details
a. depends on ____ of
crystals/grains
b. The faster the lava
cools, the _______
the crystals
c. The slower the
magma cools, the
_____ the crystals.
Summarize
Igneous rocks are formed from lava
or magma. Intrusive Igneous rocks
are formed from magma and have
large crystals/grains. Extrusive
Igneous rocks are formed from lava
and have small or no
crystals/grains.
B. Uses of Igneous Rocks
•
•
•
•
Obsidian used to be used to make
sharp tools
Granite used for statues, bridges,
buildings, and decoration
Basalt used to make gravel
Pumice used for cleaning and
polishing