About 252 million years ago, more than 81 percent of animal life in the oceans and 89 percent of animal life on land went extinct. This event, called the "end-Permian mass extinction" (EPME), ...
Top: Map of thorium concentrations near Compton crater on the lunar far side. Bottom: LRO view of the felsic highland volcano. After Jolliff et al. (2011), Nature Geoscience 4, 566. The flood of new ...
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