The
internal
energy
of
the
Earth
comes
from
two
main
sources
:
a
)
The
energy
produced
by
the
____________________
of
radioactive
____________________
in
the
mantle
and
crust
.
b
)
The
____________________
of
the
heat
accumulated
during
the
Earth's
____________________
.
The
solid
part
of
the
Earth
is
divided
into
different
____________________
separated
by
areas
known
as
____________________
,
in
which
the
seismic
waves
change
their
____________________
.
Lithosphere
:
It's
the
____________________
layer
of
the
Earth
,
it
included
the
____________________
and
the
____________________
____________________
.
It's
subdivided
into
____________________
____________________
.
The
movement
of
the
tectonic
plates
:
Heat
rising
and
falling
inside
the
mantle
create
____________________
____________________
,
which
move
the
plates
.
The
point
where
two
plates
meet
is
called
a
plate
____________________
.
There
are
different
types
:
At
a
____________________
or
divergent
boundary
the
plates
move
____________________
.
At
a
____________________
or
convergent
boundary
the
plates
move
towards
____________________
____________________
.
At
a
____________________
,
____________________
or
transform
boundary
the
plates
____________________
____________________
____________________
____________________
.
