Igneous Rocks

Question 1

Porphyritic texture

Answer 1

rocks characterized by large, well formed crystals surrounded by finer-grained crystals of the same mineral or different minerals.

Question 2

Vesicular

Answer 2

A rock characterized by a spongy looking appearance due to gases being trapped in the think magma.

Question 3

Veins

Answer 3

igneous intrusions that sometimes contain valuable ore deposits.

Question 4

pegmatities

Answer 4

veins of extremely large-grained minerals that contains ores.

Question 5

intermediate rock

Answer 5

igneous rock that contains less silica than felisic but more than mafic.

Question 6

felsic rock

Answer 6

lighter in color and also contains a lot more silica and feldspar (called granite)

Question 7

mafic

Answer 7

dark in color and contains a lot of magnesium and iron (also called a basalitic rock)

Question 8

Partial melting

Answer 8

the process where by some minerals melt at a relativity low temperature while other minerals remain solid.

Question 9

Fractional Crystallization

Answer 9

the first minerals to crystallize are the last minerals to melt.

Question 10

What are the four main factors involved in the formation of magma?

Answer 10

Temperature, Pressure, Water content, and mIneral content.

Question 11

Sillica

Answer 11

Sillica affects the melting temperatures and impacts how quickly magma flows.