Question: Which dating method is used to date rocks older than 100000 years?

What type of dating is most useful for the oldest rocks on Earth?

Uranium-lead dating is useful for dating igneous rocks from 1 million years to around 4.6 billion years old. Zircon crystals from Australia are 4.4 billion years old, among the oldest rocks on the planet.

What is the oldest animal that is still alive?

Currently the worlds oldest known land animal is Jonathan, an 183-year-old Aldabra giant tortoise that lives on the grounds of the governors mansion in St. Helena, an island off West Africa.

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