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THE BIG ROCK

If you walk around a certain rock in Australia, you really go on a hike---a five-mile (8-kilometer) hike. This great rock is a mile and a half (2.4 kilometers) long and a mile (1.6 kilometers) wide....

How far is it?

A map may be millions of times smaller than the real land it pictures. So how can you find out how far it is from one place to another? To find out, you use a "measuring stick" called a scale. Scale...