PECOS — The reaction was instantaneous. The clear water sample thickened and turned yellowish brown. The solids weren’t present for long: Another solution was added and, as a student shook the bottle, the liquid turned a transparent amber.

Slowly but surely, another student dripped liquid from a pipette into the sample, occasionally shaking the bottle as the color faded back to clear.

The Pecos High School students were on their second field trip Tuesday as part of a state-funded project to both test stream water and immerse kids in nature, building their interest in conservation.

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