Download Igneous Rocks Advanced Organizer

Igneous Rocks Advanced Organizer
I. Formation of Igneous Rocks
a. Intrusive igneous rocks are formed when _________________ hardens ______________ Earth’s
________________________.
 ____________________ crystal/mineral grains.
 Takes a _______________ time.
b. Extrusive igneous rocks are formed when ______________ hardens ________________ Earth’s
______________________.
 __________ obvious crystals.
 Takes a relatively __________________ amount of time.
II. Classification of Igneous Rocks - Igneous rocks can be classified based on their
____________________________ and _________________________.
a. Texture
 Coarse-grained texture is caused by _____________ cooling resulting in
________________________ crystals.
 Fine-grained texture is caused by _________________ cooling resulting in
_________________________________________ mineral grains.
 Glassy texture is caused by ____________________ ______________ cooling.
 Porphyritic texture is caused by _________ then _______________ cooling. You will see a finegrained texture with larger crystals within the rock.
 Vesicular – a texture that has lots of ___________________ (holes) from escaping __________.
Texture:
_____________________.
_______________crystals
Texture:
________________________.
___________________ crystals
Texture:
_____________________.
_______________ crystals
Texture: ______________
__________crystals
b. Composition – What the rock __________________________________.
 Granitic composition rocks are made mostly of ______________________ minerals like
_____________________ and ________________________.
 Basaltic composition rocks are made mostly of ________________________ silicate
minerals like pyroxene.
 Andesitic composition rocks are between _____________________ light-color minerals
and _____________________ composition dark-colored minerals.
 Ultramafic composition rocks are made mostly from ______________ and
______________________ minerals like olivine.
Look at the igneous rock samples and sketch/write observations about each one in the chart below.
Rock
Chemical
Composition
Granitic
Andesitic
Basaltic
Ultramafic
Color and
% dark
minerals
Texture
Other observations
intrusive, extrusive,
has pores, heavy, etc
Sketch
Rock Name?