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When the solar system was created, earth was formed from gas and dust that gravity pulled together and is now the third rocky planet from the sun. It has an inner core, an outer core, a mantle and a crust. It affects life because without the earth, we wouldn't be able to do this presentation.                Source : https://solarsystem.nasa.gov

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Earth is made of 21% oxygen, 78% nitrogen and only 0.9% of argon (with 0.1% other gases including: CO2, methane water vapor and neon (source : http://earthsky.org). All plant and animal life on earth need oxygen to survive. Oxygen exists in our atmosphere because of the process of plants called photosynthesis. This process makes plants inhale CO2 and exhale oxygen wich makes us live. (Source : http://naturalhistory.si.edu)

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The first lives on Earth were microscopic organisms called microbes. We discovered they were the first lives because we found an evidence of their presence in rocks almost 3.7 billion years old. This "evidence" was a type of carbon molecule that can only be produced by living things (Source: naturalhistory.si.edu)

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The first plants appeared during the Ordovician period. At this time, life was diversifiying rapidly. It is believed that the plants had evolved from an aquatic green alga protist ( Source: flexbooks.ck12.org ). Plants are very useful because they produce oxygen, which makes us live. They also provide food for herbivores and omnivores, but they can also be a good hiding place for predators.

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The first spiders were: thin-waisted arachnids with abdominal segmentation and silk-producing spinnerets. They are known from fossils such as the Attercopus fimbriungus. This spider appeared more than 150 million years before the dinosaures. Spiders evolved for at least 380 million years. There may be more than 45 000 existent species that have been organized taxonomically. Source: en.wikipedia.org/ australian.museum. They affected the Earth because they are very useful to humans and other creatures by eating dangerous insects like: mosquitos, other spiders, flies, wasps... Which helps regulate the insect population on Earth ( no overpopulation of insects ). Source: our knowledge (and from experience 😉).

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About 200 mya, earth didn't have seven continents : instead, it was a big chunk of the earth that joined them together : This is called Pangea.  If it hadn't changed, we would all live in one big continent. This could have affected our lifestyle, because a pesident would have trouble controlling everybody and we would all follow the same way of life. Source : http://livescience.com

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Homo sapiens, were the first modern humans, that were evolved from their early predecessors in between 200,000 and 300,000 years ago. They developed the capacity to speak about 50 000 years ago, and started moving outside of Africa about 70 000-100 000 years ago. Humans are the only known species to have successfully populated the Earth. They adapt in a way that puts them at the top of the food chain. It is important to know that Homo sapiens ( us ) are part of a group called hominids. Scientists think that hominids diverged from other primates that emerged from 2.5 and 4 million years ago, in Africa. Early humans impacted the Earth because they took control of animals, lands, natural ressources and biodiversity. Humans affected ( and still affect ) the Earth with climate change, overpopulation and by killing animals. Source: khanacademy.org (+ our brains)

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Image : ImageForArticle_898_44924040741493052171.jpg 750 × 441 pixels                                                                                                                     Generating electricity and heat causes global warming. Factories burn fossil fuels to produce energy for cement, iron, steel, electronics, plastics, clothes, and many other goods...  Machines used in the manufacturing  often run on coal,oil, or gases, which release CO2 into the atmosphere and provoke global warming. Cutting down forests is also bad for the earth. The global warming effects are : hotter temperatures, more severe storms, increased drought, rising oceans, extinction of species (especially the ones that live in cold temperatures), not enough food for the humans and animals, more health problems, and poverty. If we continue changing the climate, it may affect the existence of humans and animals on earth as well as plants and biodiversity. Souce : http://un.org

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Global warming caused by humans 100 years ago (and still happening)

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Global warming caused by humans 100 years ago (and still happening)