One of the most significant challenges is building an airplane had to do with "propulsion", since the technology that allowed motors to have enough energy to lift an airplane into the sky with a passenger wasn't available for most of history.
The Two guiding ideas do geographers use to measure movement is Push and pull factor and distance and time. The correct option are (A) and (B).
<h3>Who is Geographer?</h3>
Geographer is the person who studies about the earth. It studies in the detail i.e. the features of the earth, distribution of the resources, its formation, physical properties etc.
The complete question is attached below.
Geographers base their measurements of mobility on the push-pull factor, as well as distance and time. The appropriate choices are (A) and (B).
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He did not want information going to the public that would make him look lie a fool, or start a rebellion