Chapter 2 Lesson 3: Igneous Rocks
Study and Review Guide
1. Igneous rocks are formed from
the cooling of magma or lava.
How are igneous rocks classified?
Mineral composition
Directions: Circle the correct term that matches.
Choose Intrusive or Extrusive.
2. Formed from lava that erupted
onto Earth’s surface.
3. Granite is the most abundant
4. Basalt is the most common
5. Formed when magma hardened
beneath Earth’s surface
6. Fine grained or glassy texture
7. Larger grains
8. The texture of an igneous rock depends on
the ______________ and _______________
Of its mineral crystals.
What is the exception to this rule?
Igneous rocks that lack a crystal structure.
9. Rapidly cooling lava forms
____________________ grained igneous rock
with _____________ crystals or
___________________ Crystals at all.
10. Slowly cooling magma forms coarsegrained rocks with large crystals
such as granite.
11. Lava that is low is silica usually forms
Rocks such as _____________________.
12. Magma that is high in silica usually
forms _______________
-colored rocks such as ______________.
13. Many igneous rocks are
hard,___________, and durable. People
throughout history have used igneous
rocks for ________________________
and _______________________
Directions: Describe how each of these igneous rocks can be used.
14. granite
14. Fortresses in Peru (building blocks), building
materials ie. Egyptians: statues; Today: curbstones
and floors
15. basalt
15. cobblestones, landscaping, roads
16. pumice
17. obsidian
18. perlite
18. Mixed with soil and used for starting vegetable

Chapter 2 Lesson 3: Igneous Rocks