1. according to the scientific community of alfred wegener's day, what was the flaw in his theory of continental drift?
he could not explain the present day movements of earth's plates.
he could not explain the speed at which the plates were moving.
he could not explain the force that could move earth's plates.
he could not explain where the plates would be heading in the future.

2. which of the following is the best explanation for the driving force of plate tectonics?
convection cells
earth's magnetism
gravity
the ring of fire