Science (Maps)

Must all topographic maps have a contour line that represents 0 m of elevation?

I'm not sure about this question, but I don't think you do need a line of 0 m because each contour line is exactly the same apart from each other, so you could just subtract that amount to get zero. Am I right?

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  1. That depends on the location you're mapping. The lowest point on the contour map is marked. It could be 0 if the lowest part of the map is at sea level, or it could be below 0, if part of the map is below sea level.

    Each contour line represents the height of a landform. If it's a map of a steep hill, the contour lines are close together. If it's a map of gentle hills, the contour lines are much farther apart.

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    Ms. Sue
  2. thank you Ms. Sue. I had a very steep rock, and the lines were close together. I guess not every landform must have a 0m contour line then.

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