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The clip to which you linked only proves my point!

Although titled "Plate Tectonics for Kids," it did a decent job of explaining Plate Tectonics.

The graphics were all right, but the narrator oversimplified a few things. For a children's program, probably OK.

In any event, there was never any talk or image in the clip indicating that tectonic plates are "basically floating on a molten inner core."

Rather, the clip correctly points out that the Earth's Lithosphere (crust - including plates - plus upper part of the Mantle, which can behave elastically in a geological time-frame, i.e., over thousands of years) - rests on the Asthenosphere, which is almost solid, but mechanically weak; which in turn rests on the Outer Core (liquid metal); which in turn rests on the Inner Core (solid metal).

The graphics in the clip (and in elementary school textbooks) frequently use orange and yellow for visual clarity - but that should not be taken to mean that the corresponding regions are molten.

Regards,