article_snippet.sent: partly-molten rock could fill the Grand Canyon 11 times over.
article_snippet.sent: To put this into perspective, the Grand Canyon in Arizona has a volume of 1,000 cubic miles (4,168 cubic km) meaning the molten rock in the upper chamber would fill it two-and-a-half times, and the rock from the larger lower chamber would fill it 11 times.
article_snippet.sent: For comparison, the Grand Canyon in Arizona (pictured) has a volume of 1,000 cubic miles (4,168 cubic km) meaning the molten rock in the upper chamber of Yellowstone would fill it two-and-a-half times, and the rock from the larger lower chamber would fill it 11 times .