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The Priscoan Eon

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FC: By: Lara Moawad Date: April 11, 2103 Section: 7-5

1: My topic is about the Priscoan Eon Table of Content Topic Page Introduction 2 Time 4 Climate 6 The Big Bang 10 Summary 14 Bibliography 18

2: Introduction The first Eon of Time is the Priscoan Eon. This eon represents the time on Earth when life did not exist. At that time the universe was forming and taking shape. It was like an image of hell during that time. There wasn’t any oxygen, or water, or anything else other than a hot molten climate and things colliding very swiftly with extreme force and high friction. Everything that was forming during this period was molten and extremely hot. This eon was full of hot lava and steam and violent movements in the universe. It wasn’t until this eon ended that everything started to cool and become solid.

4: Time The Priscoan eon is the earliest eon in the history of life. It began from the first accretion of planetary material, 4.56 Ga (around 4,600 billion years ago) until the date of the oldest known rocks, 4.40 Ga (about 3,800 million years ago) . At this time there was no evidence of life. It has been said that no creatures or plants lived at that time. There isn’t much record of the Priscoan Eon, but scientists think that this eon was the most violent of them all.

6: Climate The Priscoan eon had a hot, poisonous, acidic atmosphere, because Earth's surface was molten. This eon is now known as the Hadean eon due to the harsh, unpleasant, climate. Hadean comes from the word Hades, which is Greek for "underworld," referring to the hellish conditions on the planet at the time, when much of the Earth's surface was molten. Everything that was forming at that time was very hot and had unbelievable temperatures. Estimate suggest that the earliest oceans were hot and acidic. The ocean temperatures were between 80 and 100 Celsius. Geological evidence

7: suggest that the Earth's early atmosphere had little free oxygen, but direct evidence of oxygen content during Earth's history has been unavailable. The climate of the Hadean eon was drastically different than what it is today. In fact, this was the hardest and most hottest eon of them all due to high volcanism, a practically molten surface, and frequent collisions with other solar system bodies.

10: The Big Bang The Priscoan or Hadean eon is known as the hidden heart of the Earth's beginning. This eon marks the beginning of creation (4.6 billion years ago) when the big bang started life. It all started with a very small dot that expanded and grew faster than the speed of light. The basic sources of nature were unified very quickly causing gravity to break away as it grew. This released more light and heat, causing a war between millions of particles. As a result more energy was formed and it became very hot. During this time many things started to form. The solar system, the sun, oceans, and continents

11: started to form and expand rapidly. The solar system was forming in a cloud of gas and dust around the sun, which had been formed from an old massive star. Surrounding particles started growing and colliding into large pieces and they formed into planets. Large planetesimal collisions released a lot of heat causing the Earth and other planets to be molten at the time. The Earth was also constantly being bombarded by meteorites from outer space. This was a very rough and harsh time due to the molten lava and the formation and expansion of matter. Suddenly, something happened that would change the universe. The

12: temperature cooled and matter stopped being produced. Around 3,800 years after the big bang, the temperature fell 3,000 Kelvin. There was suddenly a massive release of life.

14: Summary The Hadean or Priscoan Eon was a rough unpleasant time in which there was no sign or evidence of life except for a hot molten climate. It is unlikely that life could have formed and established in the extremely volatile conditions of the Hadean Eon. If life had begun to form at this time, it most likely would have been destroyed over and over again until optimum conditions were in place for life to take a foothold. As things started to solidify, the Priscoan eon was getting to an end. At about 3.8 billion years ago, at the end of the Priscoan Eon, the end of large formations in the inner solar system

15: were taking place. Although not yet fully confirmed, the 3.8 billion year boundary also may be the point at which the first evidence of life on Earth appeared. The Priscoan eon was absolutely no spot for a vacation, but it was the eon were all the matter took place and as soon as that solid rock formed on this planet, Earth’s geological history began.

18: Bibliography "UA Geosciences." UA Geosciences. N.p., n.d. Web. 16 Mar. 2013. . "redOrbit - Science, Space, Technology, Health News and Information." redOrbit - Science, Space, Technology, Health News and Information. N.p., n.d. Web. 16 Mar. 2013. . "Solidearth.net." Solidearth.net. N.p., n.d. Web. 16 Mar. 2013. .

19: "Paleobiology Home." Paleobiology Home. N.p., n.d. Web. 16 Mar. 2013. . "UCMP - University of California Museum of Paleontology." UCMP - University of California Museum of Paleontology. N.p., n.d. Web. 16 Mar. 2013. .

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