C is the answer.
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You see how much the scale is, let's say that it is 150 mm=300 miles. If it goes over, you can measure it with a ruler, or move with your hands, measuring it as well as possible and estimating. Hope this helps! :)
Appalachian Mountains. It has been said that they were as tall as the Rocky mountains. I hope this helped. :)
The collapse of the Soviet Union
<span> factors were responsible for environmental improvements in Eastern Europe during the 1990s</span>