In 1913 the first geologic time scale was proposed by a british geologist Arthur Holmes. Holmes believed that the Earth was about 4 billion years old. Today scientist estimate that the Earth is about 4.6 billion years old. Why is the geologic ime scale importan to us? The geologic time scale is used to determine how old something is. For example, the geologic timescale helps us understand how old the Earth is and how old rocks on it are.
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