❏igneous rocks are formed from solidifying molten
rock (magma)
❏magma may rise through the crust to form
volcanoes
❏when molten rock erupts from volcanoes it is
known as lava and forms extrusive igneous rocks
❏when magma solidifies deep in the crust it forms
intrusive igneous rocks
❏different igneous rocks are made of different
minerals
❏igneous rocks are composed of randomly
arranged, interlocking crystals
❏if crystals are small, the rock probably formed
from extruded lava and cooled rapidly, as in a
volcanic eruption
❏if crystals are large, the rock formed from magma
that cooled more slowly, probably deep in the
Earth’s crust
Teachers’ Notes
Route through the Brief
Pupil Research Brief
Introduction
In this Brief the teacher and pupils take on the roles of
UPIL
ESEARCHER
NITIATIVE
I
R
P
Syllabus Coverage Subject Knowledge and Understanding
Mars-ology
