Igneous rocks Flashcards
1
Q
how do igneous rocks form?
A
when molten rock solidifies
2
Q
list 2 ways how we classify igneous rocks
A
by where they are formed and by their mineral composition (whats inside them)
3
Q
how do you describe basaltic igneous rocks?
A
dark and dense
4
Q
what gives basaltic rocks these characteristics (dark & dense)?
A
the presence of iron and magnesium
5
Q
where is basalt most commonly found?
A
on the ocean floor
6
Q
how do you describe granitic igneous rocks?
A
light colored rocks with lower density then basalt
7
Q
what minerals does granitic rocks contain?
A
silica and a little of iron and magnesium
