Four Billion Years · DeepTime

One unbroken camera flight through the history of life, from a glowing magma ocean 4.5 billion years ago to a hand stencil on a cave wall. Twelve places on one path: a hydrothermal vent, stromatolite shallows, the sky turning blue, Snowball Earth, the first animals, a Cambrian reef, a fish hauling out, a coal forest, the Permian ash, the dinosaurs and the impact, and an ice-age cave. Scrub the timeline, switch it between linear and log time, and stop anywhere to look around while the counter and the oxygen, carbon dioxide and day-length gauges show how the planet changed.

Subject: Biology · Level: Middle school, High school · Topics: Geologic time scale, Early life and the oxygen revolution, Mass extinctions, Linear and log time

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