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Magnitude Estimate- A very rough estimate. A magnitude estimate tells whether an answer should be in the tens, hundreds, thousands, ten thousands, and so on.

Map Legend(or map key) - A diagram that explains the symbols, markings, and colors on a map.

Map Scale- A tool that helps you estimate distances between places shown on a map by relating distances on the map to distances in the real world.

Maximum- The largest amount or the greatest number in a set of data.

Mean- The sum of a set of numbers divided by the number of numbers in the set. The mean is often referred to simply as the average.

Median- the middle value in a set of data when the data are listed in order from smallest to largest. If there is a even number of data points, the median is the mean, or average, of the two middle values.

Metric System of Measurement- A measurement system based on 10's