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Earth Science

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A tractor sprays fertilizer or pesticides on a green field.
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MaYcaL via iStock
Synthetic fertilizer has increased the amount of nitrogen compounds in the biosphere, compounds that must be converted by microbes back into nitrogen gas.

A rare atomic fingerprint reveals how ecosystems clean nitrogen pollution

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Eruption’s Echoes

National Honors

Tonga Eruption
A view of the columnar basalt forming Devils Postpile

Geology Underfoot

To Flee or Not to Flee

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