extrusive igneous rocks Flashcards
1
Q
how are extrusive igneous rocks formed?
A
they form when the molten erupts above the surface as lava and cools, forming rock
2
Q
do they have big crystals or small?
A
small
3
Q
why do they have small crystals?
A
because they cooled quickly
4
Q
list 3 examples of extrusive igneous rocks
A
rhyodite, andesite and basalt
