Plate tectonics suggests that the floats and moves on the

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1

Plate tectonics suggests that the ( a. biosphere) floats and moves on the ( a. atmosphere)

or

plate tectonics suggests that the ( b. asthenosphere) floats and moves on the ( b. lithosphere)

or

plate tectonics suggests that the ( c. geosphere) floats and moves on the ( c. asthenosphere)

or

plate tectonics suggests that the ( d. lithosphere ) floats away and moves on the ( d. geosphere)

which one ?