199
There
are
three
groups
of
rocks:
IGNEOUS
ROCKS
-
These
were
once
molten
(melted)
rocks
which
cooled
and
solidified.
Some
igneous
rocks
are
formed
at
the
surface
when
lava
runs
out
of
a
volcano
and
cools.
This
type
of
igneous
rock
cools
quickly
in
air
or
water,
so
the
crystals
do
not
have
much
time
to
grow.
The
crystals
in
these
rocks
will
be
small.
Basalt
is
an
example
of
an
igneous
rock
which
cooled
from
lava.
Some
molten
rock
does
not
reach
the
surface
of
the
Earth.
It
remains
under
the
surface,
and
is
called
magma.
This
will
cool
slowly.
The
crystals
have
a
long
time
to
grow,
and
will
be
quite
large,
so
that
we
can
see
them
without
a
microscope.
An
example
of
an
igneous
rock
formed
below
the
surface
of
the
Earth
from
magma
is
granite.
SEDIMENTARY
ROCKS
-
these
are
often
made
up
of
particles
of
other
rocks
which
are
cemented
together.
Good
examples
of
sedimentary
rocks
are
sandstone,
limestone
and
chalk.
METAMORPHIC
ROCKS
-
These
are
made
by
heating
or
squashing
other
rocks
(
Heat
or
Pressure)
Good
examples
of
metamorphic
rocks
are
slate
(formed
by
pressure)
and
marble
(formed
by
heating
limestone).
Drag the Tiles into position to put the segments of text into the correct order.
Unscramble the text by putting the words below into the correct order in the box above.

19
"molten",13
"cooled",17
"igneous",21
"lava",29
"air",45
"crystals",59
"small.",65
"magma.",97
"slowly.",101
"crystals",103
"microscope.",123
"granite.",140
"rocks",153
"cemented",156
"limestone",165
"chalk.",167
"Heat",181
"slate",190
"marble",195
Fill in the gaps by typing in the missing word, or by dragging the correct word from the list below.
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