What did Harry Hess and Robert Dietz suggest the cause of the continents moving was?
a. Convection currents
b. Radioactive decay
c. Conduction
d. Gravity
ANS: A
New crust that is being formed moves outwards from the source. Hess and Dietz suggested that new
seafloor develops at the Mid-Atlantic Ridge and that this same force causes continents to move as
well. The motion would powered by convection currents. Later this hypothesis would be called
seafloor spreading. Information can be found in the section The Breakthrough: From Seafloor
Spreading to Plate Tectonics.
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