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224 pages, Paperback
Published August 14, 2024
Iridium is very rare, but an unusually high amount of it can be found in a fine layer of quartz dust in rocks all over the world. This dates from 65 million years ago, when a 10-km (6.2-mile)-wide asteroid crash-landed in Mexico, causing a vast explosion that is believed to have led to the extinction of the dinosaurs on Earth. The layer of iridum-containing dust is the remaining debris from that impact.