Final answer:
The primary counterargument against Wegener's theory of continental drift was the absence of a mechanism explaining how solid continents could drift, leading to skepticism among many scientists.
Explanation:
The main counterargument against Wegener's evidence proposing continental drift was the lack of a mechanism explaining how solid continents could move over vast distances. Critics pointed out that without a clear mechanism, the idea of moving landmasses was too radical for many scientists to accept. This led to skepticism and rejection of Wegener's theory until the development of plate tectonics decades later.
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