4: igneous rocks and intrusive activity Flashcards
1
Q
magma is
A
below the earths surface
2
Q
lava
A
is on the earth’s surface
3
Q
igneous rocks are primarily composed of what mineral
A
silicate minerals
4
Q
the amount of _____ in an igneous rock is an indication of its composition
A
silica
5
Q
the rate of cooling of what largely determines a rocks texture?
A
the cooling of magma
6
Q
fine grained texture in an igneous rock
A
aphanitic
7
Q
course, grained texture in an igneous rock
A
phaneritic
8
Q
if the lava had high gas content its
A
vesicular
9
Q
if the lava was high in silica the rock will be
A
glassy
10
Q
if the material in a volcanic rock erupted explosively
A
pyroclastic
