Geologic Time Periods Time Scale Facts Britannica 4.5 billion years ago: earth was born through the accretion of these planetesimals. during this time, our planet was a hot, molten mass as a result of the energy generated by numerous impacts and gravitational compression. 4.4 billion years ago: earth’s surface cooled and solidified, forming a thin crust. The first eon in earth's history, the hadean, begins with the earth's formation and is followed by the archean eon at 3.8 ga. [2]: 145 the oldest rocks found on earth date to about 4.0 ga, and the oldest detrital zircon crystals in rocks to about 4.4 ga, [34] [35] [36] soon after the formation of the earth's crust and the earth.
Evolution Of Earth Timeline Illustration Stock Image C026 6373 Earth’s timeline and history. 4,567,000,000 years ago, earth was covered in molten lava. earth was completely unrecognizable. in its earliest stage of formation, it was uninhabitable as it clumped from a cloud of dust. about 1,000,000,000 years ago, earth had its first signs of life. single celled organisms consumed the sun’s energy. A photo timeline of earth's 4.5 billion years of geologic history. (image credit: university of copenhagen, lars a. buchhave) it's hard to know when the earth first formed, because no rocks have. At its beginning, earth was unrecognizable from its modern form. at first, it was extremely hot, to the point that the planet likely consisted almost entirely of molten magma. over the course of a few hundred million years, the planet began to cool and oceans of liquid water formed. heavy elements began sinking past the oceans and magma toward. The hadean is the first geological eon of earth’s history. ranging from 4.6 billion to 4 billion years ago, the name “hadean” is a reference to the hades, the greek god of the underworld, and describes the hellish conditions present after the earth’s initial formation.
Formation Of The Earth Timeline At its beginning, earth was unrecognizable from its modern form. at first, it was extremely hot, to the point that the planet likely consisted almost entirely of molten magma. over the course of a few hundred million years, the planet began to cool and oceans of liquid water formed. heavy elements began sinking past the oceans and magma toward. The hadean is the first geological eon of earth’s history. ranging from 4.6 billion to 4 billion years ago, the name “hadean” is a reference to the hades, the greek god of the underworld, and describes the hellish conditions present after the earth’s initial formation. The geological history of the earth follows the major geological events in earth's past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk shaped mass of dust and gas left. Most of this initial heat still exists inside the earth. the hadean was originally defined as the birth of the planet occurring 4.0 billion years ago and preceding the existence of many rocks and life forms. however, geologists have dated minerals at 4.4 billion years, with evidence that liquid water was present.
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