"If we had made sea level 'rise' by 250 feet each time (instead of 500 feet), we would have had twice as many contours! They would have been at 0', 250', 500' and so on! " We have no contours above 3500' because the highest point on the island, the peak of Mt Ginger, is only 3998'above sea level! It never reaches 4000', which would be the next contour!" So, we have contours at 0', 500', 1000' and so on. "What we have is a contour map! The painted lines are topographic contours: lines of equal elevation (height above sea level). "Now pay attention to this, Lou! If we want to know the elevation of any of the lines, all we have to remember is that the first one (the one on the outside) was at sea level - elevation 0'! And because we pretended that sea level rose by 500 feet each time, as we go inland, away from the sea, each line that we hit is 500 feet higher than the one before!" "And here's what the island looks like looking down at it from way up in the air!" "So here we are, Lou! Here's our island with all the lines of equal elevation painted on it! The contour lines!"
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