Are
the
continents
moving
?
1
.
-
On
the
basis
of
gathered
evidence
.
Alfred
Wegener
concluded
that
all
the
continents
had
once
been
part
of
a
single
____________________
.
2
.
-
Wegener's
concept
that
the
continents
drifted
apart
to
their
present
position
became
known
as
____________________
____________________
.
3
.
-
A
scientific
model
called
____________________
____________________
explains
that
the
surface
of
Earth
is
made
up
of
plates
that
move
.
4
.
-
Plates
move
over
the
hot
,
fluid
rock
,
or
____________________
,
in
Earth's
mantle
.
How
do
oceans
change
size
?
5
.
-
As
some
crustal
plates
move
apart
,
magma
flows
outward
and
hardens
to
form
raised
structures
called
____________________
____________________
on
the
ocean
floor
.
6
.
-
The
process
in
which
new
rock
forces
the
plates
on
the
ocean
floor
to
move
farther
and
farther
apart
is
called
____________________
____________________
.
7
.
-
Rock
found
at
mid
-
____________________
____________________
is
younger
than
the
rock
that
makes
up
the
continents
.
8
.
-
The
ocean
floor
is
largely
made
up
of
____________________
____________________
formed
by
magma
from
Earth's
mantle
that
cools
and
hardens
.
9
.
-
Further
evidence
for
seafloor
spreading
is
provided
by
the
____________________
of
seafloor
rock
.
