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The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [3]
Names of large numbers. Numbers that are larger than one million are usually either represented using scientific notation, or by words. [1] There are two main ways of using words to write large numbers.
Hutton didn’t even try to assign an age to Earth, but we now know that it is approximately 4,570 million years old. Using the scientific notation for geological time, that is 4,570 Ma (for mega annum or “millions of years”) or 4.57 Ga (for giga annum or billions of years).
Eons. In geochronology, time is generally measured in mya (million years ago), each unit representing the period of approximately 1,000,000 years in the past. The history of Earth is divided into four great eons, starting 4,540 mya with the formation of the planet. Each eon saw the most significant changes in Earth's composition, climate and life.
Millions and Billions. The Earth is 4.54 billion years old. Knowing this is not simply some esoteric piece of trivia. Instead, the discovery of Earth’s great antiquity is the science of geology’s crowning achievement. Why does it matter?
14 Ιουλ 2009 · The story of evolution spans over 3 billion years and shows how microscopic single-celled organisms transformed Earth and gave rise to complex organisms like animals
20 Οκτ 2013 · The resulting knowledge has led to the current understanding that the earth is 4.55 billion years old. That takes us to the end of this series of papers but not to the end of the story.
