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EQ: How are Rocks Classified?
Classifying Rocks
Rocks are made of minerals ________________________________________
Some rocks are made of a __________________________________
When studying a rock sample, geologists observe the rock’s
_____________________________
_______________________________________________________________________
Rock’s Texture
A rock’s _____________ is the __________, __________, and __________ of the rock’s
grains
Grain Size
a. fine-grained (____________________)
b. ____________________ (large-granite)
Grain Shape
a. smooth and rounded (____________________)
b. _______________ (breccia)
Grain Pattern
a. foliated (_______________)
1. ______________________________
.
2. ______________________________
b. non-foliated (_______________)
c. looks like rows of ________________________________________
d. occur randomly
No Visible Grains
a. have _________________________ (obsidian)
Mineral Composition
By looking at a small sliver of a rock under a microscope, geologists can observe the size
and
shape of the crystals and __________________________________________________
Also, geologists can do tests to identify the physical properties of
___________________________
mafic= __________________________ rocks (poor in silica) (basalt)
felsic = light-colored rocks (____________________) (granite)
Rock Origin
Origin how and where the rock was formed
1. igneous rock = forms from the _______________________________________________
a. ____________________= formed above the surface (lava)
b. intrusive =
______________________________ (magma)
2. sedimentary rock = forms in layers from other rocks, plants, and animals through a
process of _________________________________________________________________
a. clastic rock
b. organic rock
c. chemical rock
3. metamorphic rock = formed when existing rock is changed by
_______________________________________________________
a. _________________________
b. _________________________
Compare and Contrast Rocks
Compare – Rocks in each group make up ____________________ and are composed of
_______________________________.
Contrast – Rocks are _______________ in the ______________________________.
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