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How Old Is Earth -

Sea plants and first multicellular organisms emerge. 11:00 PM: Dinosaurs arrive. 11:40 PM: Dinosaurs go extinct. 11:58 PM: Modern humans (Homo sapiens) appear.

The Earth is approximately , with a margin of error of about 50 million years (roughly 1%). How we know how old is earth

Scientists arrived at this number primarily through of meteorite fragments and the oldest known rocks from the Earth and Moon. By measuring the decay of radioactive isotopes (like uranium turning into lead), geologists can calculate how much time has passed since the rock formed. The timeline in perspective Sea plants and first multicellular organisms emerge

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how old is earth