Dating relative rock


27-Nov-2014 16:43

Life arose on Earth by 3.5 billion years ago, though some geological evidence indicates that life may have arisen as much as 4.1 billion years ago.According to radiometric dating and other sources of evidence, Earth formed about 4.54 billion years ago.Earth gravitationally interacts with other objects in space, especially the Sun and the Moon.The Moon is the Earth's only permanent natural satellite; their gravitational interaction causes ocean tides, stabilizes the orientation of Earth's rotational axis, and gradually slows Earth's rotational rate.The remaining 29% is land mass—consisting of continents and islands—that together has many lakes, rivers, and other sources of water that contribute to the hydrosphere.

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Within the first billion years of Earth's history, life appeared in the oceans and began to affect the atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms.

Since then, the combination of Earth's distance from the Sun, physical properties, and geological history have allowed life to evolve and thrive.