Of course, it would be as dangerous to overreact to history by concluding that the majority must now be wrong about expansion as it would be to reenact the response that greeted the suggestion that the continents had drifted. The cases are not precisely analogous. There were serious problems with the pre-drift world view that a drift theory could help to resolve, whereas Earth expansion appears to offer no comparable advantages. If, however, physicists could show that the Earth s gravitational force has decreased with time, expansion would have to be reconsidered and accommodated.
24. The passage indicates that one reason why the expansion hypothesis has attracted little support is that it will not
overcome deficiencies in current geologic hypotheses
clarify theories concerning the Earth s gravitational forces
complement the theory of continental drift
accommodate relevant theories from the field of physics
withstand criticism from scientists outside the field of geology
25. The final acceptance of a drift theory could best be used to support the argument that
physicists are reluctant to communicate with other scientists
improbable hypotheses usually turn out to be valid
there should be cooperation between different fields of science
there is a need for governmental control of scientific research
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