igneous Basics Flashcards
1
Q
what are igneous rocks
A
ig prefix for related to fire
formed as magma cools and solidifes (crystallizes)
1
Q
what is magma
A
molten rock formed by partial melting of solid rock in the earth’s mantle and lower crust
typically contains ~40 to >70 wt% silica
2
Q
3 components of igneous rocks
A
melt
solids
volatiles
3
Q
what is lava
A
magma flowed onto earth’s surface
4
Q
3 types of igneous rocks
A
intrusive rocks
extrusive (volcanic) rocks
pyroclastic rocks
5
Q
porphyritic
A
igneous rock texture in which large crystals are set in a finer-grained or glassy groundmass
