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  1. Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System . Initially, Earth was molten due to extreme volcanism and frequent collisions with other bodies.

  2. Geological history of Earth. Earth's geological history is a period of time since the Earth's formation to the present day. It is divided into eons, eras and periods. These periods of time are usually determined via rocks or rock layers.

  3. Nearly all branches of science have helped us understand the main events of the Earth's past. There has been constant geological change and biological evolution. The geological time scale (GTS), as defined by international convention, shows the large span of time from the beginning of the Earth to the present.