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Created with Fabric.js 1.4.5 The History of the Earth Paleozoic Era 4.6 billion years ago:Earth is formed.Life starts to emergeas bacteria livingunder the oceans nearthe middle and endof PrecambrianTIme Precambrian Time Cambrian Explosion occursA large number ofdifferent organisms evolvedon Earth. Cambrian Period Ordovician Period Vertebrates start to appearinside of the oceans Silurian Period Plants become abundant onland. Early continentscollide with North America,forming early mmountains "Age of Fish"Many groups of fishevolve in the ocean.Animals start toarrive on land. Devonian Period CarboniferousPeriod Permian Period Pangaea forms asall of thecontinents collide.Permian-Triassicextinction eventoccurs, killing about90% of marine lifeand 70% of land life Precambrian Time Paleozoic Era Mesozoic Era Cenozoic Era Triassic Period Jurassic Period Cretaceous Period Extinction Theories Reptiles developed inthis period.Winged insects evolve.Numerous coaldeposits form. Permian Extinction- about 251 million years ago The Permian Period ended with most of the life on Earth dying out. The most popular theory being an asteroid collision withEarth. The asteroid impacted the earth producing large dust clouds. Volcanic Eruptions emitted carbon dioxide and sulfur dioxide into the atmosphere. The temperature on Earth rose, and the carbon dioxide levels in oceans increased while oxygen levels decreased. These factors caused 90% of ocean species and 70% of land species to die out. Cretaceous Extinction- about 65 million years ago Another mass extinction occurred during the end of the Cretaceous Period. Like the Permian Extinction, an asteroid collision wiped out most of the life on Earth. The impact released large levels of water vapor and dust into the atmosphere. Sunlight was blocked by heavy clouds and dust for several years. Plants died because of this, and animals that relied on these plants died out as well. This lead to devastating chain reaction and more than half of plants and animals on Earth were wiped out. An iridium-rich layer was formed by the dust clouds. Severe climate changes by volcanic activity is also another theory. Earliest Atmoshphere:92% CO2 (Red)5% N2 (Green)3% other gases (Yellow)(0% O2) (None) Earliest Atmosphere: 78% N2 (Red)21% O2 (Green)0.9% Argon (Yellow)0.07% Other Gases (Gray)0.03% Carbon Dioxide (Blue) The Composition of the Earliest Atmosphere compared to today. The history of our planet is an entailing, nonfiction story that lasts over 4.6 billion years. The Earth came from a ball of astral materials, and through a strange phenomenon, life developed under its oceans. However, these lifeforms were only simple, single-celled organisms, and it was to stay this way for most of the Earth's history. As the Precambrian era reached its end, more complex organisms arose, which ranged from plantlike , feathery organisms to jellyfish-like organisms. Then The Paleozoic Era saw a whole new class of organisms. The Cambrian Period had new, different types of organisms. Thisevent is called the Cambrian Explosion, for new advances in organisms, such as hard parts like shells and outer skeletons, in such a short time. All animals lived under the sea at this time. A vertebrate soon joined the other invertebrates in the fight for survival during the Ordovician Period. Also, during the Silurian Period, plants joined the unicellular organisms that were living on land. The Devonian Period 4,600 MYA 542 MYA 251 MYA 66 MYA Dinosaurs start to appearon Earth. Mammalsstart to evolve. Pangaeais still together. Dinosaurs start to becomethe dominant organismon land. Pangaeastarts to diverge whenNorth America breaks off. Birds replace flying reptiles.Flowering plants startto appear. Massextinction occurs when anasteroid collides with Earth. Paleogene Period Whales and dolphins evolvein the ocean. The firstmammals evolve. Neogene Period Mammals start to becomevery large.Climate change happensfrequently.The Andes and Himalayasform. Quaternary Period Algae, coral, mollusks,fish, and mammals thrive.Humans become thedominant species onEarth. Thick glaciersform and melt overmost of the continents 542 MYA 488 MYA 444 MYA 416 MYA 359 MYA 299 MYA 251 MYA 200 MYA 146 MYA 66 MYA 23 MYA 1.8 MYA By: Christian Otero, Khanh Nguyen, Amira Thabatah, and Wilson McDade
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