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Birth of Earth

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Text Preview Around 4.6 billion years ago, our universe was born by accretion from the solar nebula known as the Big Bang. As the sun heated up, this orbiting matter accumulated and unavoidable mass of larger bodies collide to successively create protoplanets with its own gravitational pull. During this period, Earth was nothing but molten rock from the collision with other bodies and volcanoes, temperature reaching over 2,000 fahrenheit. Not only that, but Earth then, would’ve been toxic to humans and modern life because of the lack of oxygen. Only carbon dioxide and nitrogen were presented and some water vapor. One massive planetary collision has thought to be the reason behind Earth’s tilt and the formation of the moon. As more and more meteors and other bodies continuously impact with the Earth’s surface, the Earth’s gravitational pull became stronger, giving the moon the ability to orbit the Earth. After 1 billion years of volcanic and other meteor activities, Earth finally was able to cool down and some form of life erupted. Before there was any sort of life, there was oxygen, before there was oxygen, there was water and till this day, theres no clarification on how Earth is the only planet in the universe, rich with water.There are several remarkable theories on how water came to existence billions of years ago. One is that from the gas from volcanic activities, the Earth rain for years and years, supplying it’s surface with 75% of water. Another theory is that water originated from the universe. H2O can not exist in outer space, but H and O can, separately. Hydrogen is the basic building material in the created in the Big Bang when our universe was newly formed. Oxygen exist in the process of star fusion, where stars get their energy from like the sun. If you combine H and O, you have H2O, water, which means there are enormous amount of water in space, but the only problem is, theres more hydrogen than there’s oxygen. For example, the sun only has 0.8% oxygen, the rest are mostly hydrogen and helium. The Earth was a suffocated place 2.5 billion years ago until oxygen level rose up. As mentioned in the previous text, Earth has been filled with water from who knows where, but it still lacks oxygen, the key to every living thing. Oxygen is also one of the greatest mysteries when it comes to its origin. It has been thought that oxygen was created from cyanobacteria. Cyanobacteria are single cell organisms, they are just a DNA that lives under water. Cyanobacteria are also the first life form that appeared on Earth, 3.5 billion years ago. These newborn single cell obtain their energy through a process called photosynthesis, where the sun is the main source of energy. Through photosynthesis, these living things, like today’s plants, it has the ability to produces oxygen and glucose, the key factor of the future generation species that would soon roam the Earth. As oxygen fills up the Earth’s atmosphere, many life forms appear. Despite bacteria being the first known life forms on Earth, scientists have discovered that sponges are also considered the earliest living thing on Earth. In 2012, the oldest evidence of a sea sponge found was a fossil discovered in a 760-million-year-old rock. This beat the previous record for oldest sea-sponge fossil, a 635-million-year-old sponge discovered in 2009. There may be still older fossils yet to find, but finding an older species is unlikely, as these simple organisms appear to be the progenitors of much more complicated life, including the first multicellular animals. First multicellular organisms arise from a single cell bacteria that generates multi-celled organisms, like plants, fungi, animals, and algae. Although there are many organisms, there is no clarification on how these cells came to be as animals, only theories. Roughly 600 million years ago, life evolves in the sea, plants and sea creatures dominated the Earth. Yet, for most of the Earth’s existence, the only form of life has... Show More

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