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About 4.54 billion years ago
- In a process known as runaway accretion, successively larger fragments of dust and debris clumped together to form planets. Earth formed in this manner about 4.54 billion years ago (with an uncertainty of 1%) and was largely completed within 10–20 million years.
en.wikipedia.org/wiki/History_of_Earth
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Jun 30, 2014 · By measuring the age of rocks on the moon, and meteorites found on Earth, scientists estimate the Earth consolidated by 4.54 billion years ago.
Jul 1, 2024 · Key points in Earth’s formation include the initial birth of our planet within the solar nebula, the differentiation into layers, and the dynamic interplay of geological processes that have shaped the Earth we know today.
Apr 11, 2024 · Every event that occurs within the Earth system upsets a state of equilibrium. In the chapters in this book that deal with evolution, the term for this was “stasis.” When a volcano erupts, the stasis/equilibrium is changed and a new reality emerges for a time.
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. Each eon is subsequently divided into eras, which in turn are divided into periods, which are further divided into epochs. Eon.
Jan 13, 2020 · Built around nine processes that collectively describe the state of the Earth System (including climate change, biodiversity loss, ocean acidification and land-use change), the planetary ...
- Will Steffen, Will Steffen, Katherine Richardson, Johan Rockström, Johan Rockström, Hans Joachim Sch...
- 2020
Models developed from the comparison of lead isotopes in meteorites and the decay of hafnium-182 to tungsten-182 in Earth’s mantle, however, suggest that approximately 100 million years elapsed between the beginning of the solar system and the conclusion of the accretion process that formed Earth.
Oct 18, 2024 · Earth - Structure, Composition, Development: The origin of Earth in its present form has long been the subject of intellectual interest, but since the mid-20th century scientists have made particularly significant advances both in concepts and in measurements.
