Chapter 4 and Chapter 5: Magma and Igneous rocks

Question 1

What are Extrusive rocks vs intrusive rocks?

Answer 1

o Extrusive rocks are outside the surface of the earth. Intrusive rocks are inside the surface of the earth. Intrusive have larger grain sizes because it has longer to cool; it allows the crystals longer time to grow.

Question 2

• Intrusive coarse-grained igneous rocks:

Answer 2

felsic (granite), intermediate (diorite), mafic (gabbro), ultramafic (periodotite). Involve plutons because they are inside the surface.

Question 3

• Ultramafic is only found in intrusive rocks

Answer 3

Felsic rocks are found more around volcanos. Intermediate rocks are around subduction zone volcanoes. Mafic are involved around MORs.

Question 4

• Extrusive fine grained igneous rocks

Answer 4

felsic (rhyolite), intermediate (andesite), and mafic (basalt). Involve volcanos.