GL 107 Earth Systems Science

K. Hannula

Discussion questions for 9/12/07

1.  Explain the difference between "volcanic" and "plutonic" igneous rocks.

2.  How are the textures in volcanic rocks different from the textures in plutonic rocks?

3.  What is the difference between "felsic" and "mafic" igneous rocks?

4.  Define:

• granite

• rhyolite

• basalt

• andesite