Igneous Flashcards
1
Q
As rock cools further…
A
Crystals form
2
Q
Contain…
A
Valuable minerals
Eg. Silver, gold, copper, diamonds
3
Q
Extrusive
A
- quickly on earths surface
- exits volcano
- little or no crystals
- dark colors= basalt and obsidian
- light colors= rhyolite
- fine grain crystals
4
Q
Intrusive
A
- slowly over millions of years, beneath earths surface
- magma inside volcano
- large interlocking crystals
- dark colors= gabbro
- large grain crystals
5
Q
Building material
A
Hard and highly resistant to weathering processes
6
Q
Uniform in…
A
Composition and texture, large blocks can be removed from quarries
7
Q
Forms from
A
Molten rock cooling and solidifying
