NES Earth And Space Science (307) Practice Questions - Washington NES Earth And Space Science (307) Exam

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Students measure stream nitrate concentration at five sites below a farm field after a rainstorm. Which additional information would most improve their ability to evaluate whether runoff from the field is affecting the stream?

The color of rocks in the stream channel A nitrate measurement upstream from the field collected at the same time The names of the students who collected each sample The stream's distance from the nearest ocean basin

Correct Answer:

A nitrate measurement upstream from the field collected at the same time

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