Do contour U-turns point upstream or downstream?

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Multiple Choice

Do contour U-turns point upstream or downstream?

Explanation:
Contour lines show equal elevation and how the land rises or falls. When a contour line makes a U-shaped bend near a valley or stream, the bend wraps around higher ground, so the interior of the curve sits toward higher terrain that lies upstream. Since water flows downhill, the upstream direction is toward higher ground, where the land rises to the drainage divide. In short, contour U-turns indicate the direction toward that higher ground, i.e., upstream.

Contour lines show equal elevation and how the land rises or falls. When a contour line makes a U-shaped bend near a valley or stream, the bend wraps around higher ground, so the interior of the curve sits toward higher terrain that lies upstream. Since water flows downhill, the upstream direction is toward higher ground, where the land rises to the drainage divide. In short, contour U-turns indicate the direction toward that higher ground, i.e., upstream.

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