Geologists took a new look at a sequence of old rocks in southwest Greenland and discovered the earliest example yet of plate tectonics. Until March, when the findings were published in Science, researchers thought that continents began to solidify on ...
Pumicelike, dark, and exotic, carbonado diamonds don’t look like the gemstones on engagement rings. That’s because they may have been created by an exploding star and delivered to Earth by an asteroid billions of years ago. From Canada to Australia, ...
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