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Earth & Environment

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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.

Arizona wheat field

CROP FUTURES  Experiments using circles of white pipes blowing extra carbon dioxide over crops suggest that certain nutrients may dwindle in crops grown in a carbon-enhanced future atmosphere. Here, researchers in Arizona measure the growth of wheat.

Earth & Environment

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