There
are
____________________
types
of
rocks
:
____________________
,
sedimentary
,
and
____________________
.
Igneous
rocks
are
formed
by
____________________
____________________
from
a
volcano
cooling
.
Sedimentary
rocks
are
formed
by
____________________
of
____________________
____________________
____________________
over
time
.
Metamorphic
rocks
are
formed
by
____________________
and
____________________
and
are
____________________
____________________
over
time
.
