> If humanity vanished today, in 1 million years almost all of our artifacts would be gone or burned under miles of subduction. That is completely incorrect. W

> If humanity vanished today, in 1 million years almost all of our artifacts would be gone or burned under miles of subduction. That is completely incorrect. We have sedimentary rocks from 100 M years ago on the Earth’s surface right now, that never underwent any kind of subduction.