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How Big Is It @ TwoMaps @ Coal Diver

Coal Diver Everything you wanted to know about coal, but were afraid to ask.

Instructions

The left map is a satellite photo of a coal mine in the Powder River Basin. The right is, by default, a political map of the address you chose in the starting dialog.

Change the scale of the maps so that they match each other. The rough outline of the coal mine will be shown on both maps. When you have the correct scale, you will be able to see how big the hole would be in your neighborhood.

When you think you know the answer, push the "Check Answer" button to see if you are right!