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Earth & Environment

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image of Arctic sea ice on March 7, 2017

This year's maximum extent of Arctic sea ice, reached March 7 (shown), is the smallest peak extent ever seen.

River in Egypt

WINDING WATERWAYS  Aerial views of watersheds like this one in Egypt can take on fractal-like appearances, with large rivers branching into ever-smaller streams.

Oldest rocks yet

CLASSIC ROCK  Rocks from an outcrop in northeastern Canada may have formed from material dating back more than 4.2 billion years ago. That’s older than the oldest rocks found on Earth’s surface today.

Earth & Environment

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