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Walking on Air
Earth and Space Science Studies: Dynamics of Earth's Structure
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Scientists look at evidence in rocks to explain the time involved in Earth's formation.
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Scientists use evidence in rocks to determine Earth’s age and the timing of geological events. Radiometric dating (for example uranium–lead in zircons) gives absolute ages; stratigraphy and fossils provide relative timelines; magnetic reversals, sedimentation rates, and plate-tectonic reconstructions show sequence and duration of events. Meteorites and moon rocks also constrain the Solar System’s formation, giving a consistent age for Earth of about 4.54 billion years.
Scientists use evidence in rocks to determine Earth’s age and the timing of geological events. Radiometric dating (for example uranium–lead in zircons) gives absolute ages; stratigraphy and fossils provide relative timelines; magnetic reversals, sedimentation rates, and plate-tectonic reconstructions show sequence and duration of events. Meteorites and moon rocks also constrain the Solar System’s formation, giving a consistent age for Earth of about 4.54 billion years.
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