3) Igneous Rocks

Question 0

Mantle source of igneous rock

Answer 0

Basalt, andesite, dacite

Question 1

Classification

Answer 1

• Volcanic: rapidly cooled/extrusive/lava flow

- plutonic: slowly cooled/intrusive/magma chamber

Question 2

Crust source of igneous rock

Answer 2

Rhyolite

Question 3

Minerals in igneous rocks

Answer 3

Ferromagnesian: olivine, pyroxene, amphibole, biotite
Felsic: plagioclase feldspar, orthoclase feldspar, quartz, muscovite

Question 4

Magmatic differentiation

Answer 4

Processes by which a homogenous magma segregates into different rock types
Sequential crystallization of minerals permits their separation: high density minerals sink inside magma chamber, while low density minerals will float

Question 5

Fractional crystallization

Answer 5

Separation of minerals and most common type of magnetic differentiation