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Planets need more water to support life than scientists previously thought

In a new study, Haskelle White-Gianella and Joshua Krissanen-Totton show that an Earth-sized planet likely needs at least 20 to 50% of the water in Earth’s oceans to maintain a critical natural cycle — the geologic carbon cycle — that keeps water on the surface. These new parameters could exclude many exoplanets in the so-called habitable zone and help narrow the search for life.

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Earthquake scientists reveal how overplowing weakens soil at experimental farm

In a new study published in Science, a team led by UW researchers, including Marine Denolle, David Montgomery, Abby Swann and Nicoleta Cristea, examine the impact of tilling on soil moisture and water retention using methods designed for monitoring earthquakes. By tracking changes in the speed of sound through soil, they show that tilling disrupts important soil microstructures, compromising its natural sponginess.

The method could help farmers develop tailored cultivation strategies, provide real time food information, inform earthquake hazard maps and more.

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