Name: _____________________________________Date: ___________________________period: ____
IGNEOUS ROCKS
Feature:
Description:
Origin1. Rocks formed from lava that has erupted
______________the surface of Earth.
2. Rock Formed when magma hardens ______________ the
surface.
Extrusive
Intrusive
Texture3. ____________ mineral crystals formed from
4.________________cooling.
5. ______________mineral crystals formed from
6._________________cooling.
7. Rock with _____________ crystals.
8. Rock forms quickly trapping gas creating a rock with lots
of air ________________.
9. ______________ crystals scattered on a background of
10.______________crystals
Coarse-Grained
Fine-Grained
Glassy
Frothy
Porphyritic
Mineral Composition11. Forms from magma high in ____________; low in iron.
12. They are ______________colored.
Felsic-(Granitic
(continental crust))
Intermediate
Mafic-(Basaltic (oceanic
crust))
13. They have characteristics of both felsic and __________.
14-16. ______________in silica but high in _________ and
magnesium; ________________colored rocks.
Classify the four rocks with the characteristics listed below. Classify each rock as Intrusive or extrusive
and basaltic or granitic by filling in the table.
A. fine-grained texture; light colored
B. dark colored; large grained
C. large crystals; high in silica
D. no visible crystals
Basaltic
Granitic
Extrusive
Intrusive
17.
18.
19.
20.