How long do humans live in reference to the time scale of the universe?
September 11, 2021What part of a barred spiral galaxy has the highest density of matter?
September 11, 2021
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Contour lines are used to represent elevation on a contour map.
Each contour line represents a different elevation, and you can’t have two different elevations at the same point.
An example would be how 500 meters above sea level will never be equivalent to 1000 meters above sea level.
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