W ho?
_ was the scientist who
________________
proposed the new idea of
______ in the early
__
__
__
__
__
__
__
______
that the __________
ed
os
op
pr
He
y.
ur
nt
ce
20th
______
had once been ______
Plate Tectonics
W hen ?
nstant ________. They
The continents are in co
_____ per year. A
move at a rate of ____
335 million years ago
___________ existed
_________.
that was called ______
3 Plate Boundaries
What?
The ___________is the _________ outer shell
of the planet. It is made up of the ______ and
upper mantle. It is broken into _______ plates
that move over the __________ mantle.
W here?
ken into br
is
_
_
_
_
_
_
_
_
_
_
e
Th
and many
_______ major plates
minor ones. .
Why?
_________ on the planet's surface
_______ because of _________ currents
in the ________. Hot material ______
and _______ material sinks.