Igneous Rocks

Question 0

Felsic rocks are

Answer 0

High in feldspar and quartz (silica)

Question 1

Igneous rocks form from the

Answer 1

Cooling and crystallisation of magma. They consist of interlocking crystals of different minerals.

Question 2

Mafic rocks are high in

Answer 2

Iron and magnesium.

Question 3

Fine-grained rocks -

Answer 3

Crystal sizes are less than 1mm due to rapid cooling at Earths surface.

Question 4

Coarse grained rocks have

Answer 4

Crystal sizes greater than 1mm, due to slow cooling. These can be intrusive or extrusive.

Question 5

Three intrusive rocks:

Answer 5

Grabbo, diorite, granite.

Question 6

Three extrusive rocks:

Answer 6

Basalt, andesite, rhyolite.

Question 7

When a mineral melts, the ions that compose the mineral….

Answer 7

Separate from the crystals and have an individual existence.

Question 8

Andesite:

Answer 8

Fine grained, less crystal growth. Paler.

Question 9

Basalt:

Answer 9

Dark, fine grained. Composed of pyroxene and olivine.

Question 10

Perioditite:

Answer 10

Dark, coarse grained.

Question 11

Granite:

Answer 11

Paler. Coarse. Many crystal types, including quartz and feldspar.

Question 12

Minerals in Mafic rocks (4)

Answer 12

Olivine
Pyroxene
Amphibole
Mg/Fe rich mica

Question 13

Minerals in felsic rocks (4)

Answer 13

Feldspars
Quartz
Potassium feldspar
Al rich mica