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Environmental sciences/Climatology/Paleoclimatology

Abrupt warming periods in the Arctic occurred very closely in time to similarly abrupt changes in precipitation in the lower latitudes.

Researchers have identified an impact crater bigger than the city of Paris underneath a kilometer's worth of ice — a little more than a half-mile deep — on the Hiawatha Glacier in northwest Greenland. According to a study published November 14 in Science Advances, the 31-kilometer(almost 20 mile)-wide impact crater was formed by an asteroid that struck Earth within the last 100,000 years and possibly even as recently as 13,000 years ago.