Math in… Death Valley

Elevation measures the distance above sea level. At sea level, the elevation is 0 feet. Everything above sea level has positive elevation. But what about things below sea level?

This is where negative numbers come into play. When something is below sea level, its elevation is less than 0, so it will be expressed as a negative number.

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Math in… Roller Coasters

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How can so much geographical information be put onto a small piece of paper?