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[Slide : Text/Image] [Slide : Change to spinning earth]
The heat that was... [ Slide : Earth's interior]
...accumulated when our planet was being formed is still there, hidden in the innermost layers
of the earth's core, and it's constantly reinforced by natural radioactivity.
The heat is continually transmitted to other layers before being freed into space.
[Slide : Earth's interior] During its journey toward the surface, the
heat moves semi-fluid rocks it meets along the way. Like water boiling in a pot, the
rocks in each later rise upward and shed their heat, then they fall and get heated again.
[Slide : Segment of earth above earth] Like huge and very slow cogs in a machine,
their movements shift the plates or enormous sheets...
[ Slide : Segment of earth above earth] ...that make up the thin outer layer of the
earth's crust. In this way... [Slide : Earth]
...they move whole continents. After two hundred million years, this is the
result. [: Slide : Text and image]