Fluorescent dyes can be added to groundwater in order to trace the waters path. A researcher placed some fluorescent dye into a stream. Which of the following is the most direct route for the dyed water to take to the ocean?
A. Via an aquifer
B. Via thermohaline circulation
C. Via a closed watershed
D. Via an open watershed

D) an open watershed.

Explanation:

A watershed is defined as an area of land where all the surface water drains into the same place, whether it's a creek, a stream, a river or an ocean. ... An open watershed eventually drains into the ocean, whereas water in a closed watershed can escape only by evaporating or seeping into the earth.

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