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2.2 relate the age of the Earth to the way in which geological time is described
relate the age of the Earth to the way in which geological time is described
- The 4.7 billion years of the Earth’s history is divided into periods depending on the succession of life. The geological time scale does not have regular subdivisions. The different periods of time lasted different lengths of time. There has been a succession of life from simple unicellular organisms through to the complex life forms that are on the Earth at the present time. There are five main geological eras: Archaean, Proterozoic, Palaeozoic, Mesozoic and Cainozoic (Cenozoic).