ANTIQUE RINGS The rings in trees buried by volcanic eruptions hundreds of millions of years ago show evidence of climate variations caused by the 11-year solar cycle, researchers report.
L. Luthardt and R. Rößler
SUPERCONTINENT SUPERPUZZLE Supercontinents come and go over the ages. Amasia, illustrated here from the North Pole, might form in the distant future.
Nicolle Rager Fuller
A 100-meter-wide, kilometers-long rift in Antarctica’s Larsen C ice shelf, shown in this image from Nov. 10, 2016, could soon break off a 5,000-square-kilometer chunk of ice into the ocean, scientists warn.