Scientists study spawning salmon through a riverbed lens


"Each year on the United Nations-designated World Water Day, March 22, people around the world consider the importance of fresh water to ecosystems and to us. On World Water Day 2018, the National Science Foundation (NSF) looks at Earth's critical zone—the realm on our planet's surface between the forest canopy and bedrock—and the role North America's West Coast rivers play in sustaining spawning salmon."

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