Why contours are considered to be the most useful way of showing relief?

please help me I real need of answer now please or:please help me I real need of answer now pleaseor:I have never heard any such thing. Where did you

please help me I real need of answer now please

or:please help me I real need of answer now please

or:I have never heard any such thing. Where did you hear it? There are only three ways to show relief: contours, colors, and 3D models. The intended use pretty much dictates which one to use, without any comparisons.

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