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The Earth - Beautiful Planet ( I )

A blue Jewel in space

By NguyenHoangNamPublished about a year ago 2 min read
The Earth - Beautiful Planet ( I )
Photo by Elena Mozhvilo on Unsplash

Planet Earth is the only place we know of that supports life in the universe. It is about one-third as old as the universe itself and is truly beautiful, resembling a slightly flattened sphere with a heavy metal core and a lighter outer layer. It is surrounded by a thin atmosphere that provides air to breathe, and it features vast oceans, rich plains, towering mountains, and freshwater sources, all while orbiting a star that gives us warmth and energy. But how did our planet come to be, and what is it composed of? Approximately 4.6 billion years ago, Earth formed from the remnants of dead stars, which gathered in a massive gas cloud. This cloud became denser at its center, forming an accretion disk where small particles began to stick together to create larger objects, ultimately leading to the formation of planets. This process lasted between 10 to 20 million years and remains poorly understood. During this early period, a large object roughly the size of Mars collided with Earth. The impact was intense, and had the object been larger, it could have destroyed our planet. Material from Earth was thrown into orbit, resulting in the formation of the Moon, which is the largest satellite in relation to its planet in the solar system. At this point, Earth was a harsh environment, bombarded by asteroids, filled with lava, and having a toxic atmosphere. However, significant changes were on the horizon. Earth began to cool. Water from within the planet rose to the surface and rained down, only to evaporate and form clouds again. Countless asteroids also delivered additional water to Earth. Today, the Earth's surface consists of 71% water and 29% land, with 97.5% being salty and only 2.5% fresh. Of that fresh water, 69% is trapped in ice and snow, 30% is found underground, and only about 1% consists of lakes and rivers, with even less within living organisms. Over time, as Earth cooled, a thin crust formed. However, beneath the surface, hot rock continues to move and shift, breaking apart the crust. This ongoing process, known as plate tectonics, causes large tectonic plates to drift and collide, creating towering mountains and deep trenches. For instance, Mount Everest is formed by plate collision, while the Mariana Trench results from one plate sinking beneath another. Although these features seem significant from our viewpoint, they are relatively small compared to the entire structure of the Earth. The crust, where we live, is approximately 50 kilometers thick but can range between 5 and 70 kilometers. The deepest human-made hole is 12.262 kilometers deep. Below the crust lies the mantle, a rocky layer that stretches about 2,900 kilometers. The mantle is divided into the upper and lower sections, with the upper part being viscous and supportive of the crust, known as the lithosphere. Following this is the asthenosphere, made of mostly solid material that is less mobile. The lower mantle extends down to the outer core. This outer core is a liquid layer of iron and nickel, around 2,266 kilometers thick, with temperatures ranging from 4,000℃ to 5,700℃. At the center is the inner core, a mostly solid ball made of an iron-nickel alloy with a radius of about 1,200 kilometers, roughly 70% the size of the Moon and as hot as the Sun's surface. It grows slowly at an estimated rate of about 1 millimeter per year.

NatureScience

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Comments (2)

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  • Latasha karenabout a year ago

    Excellent written

  • ReadShakurrabout a year ago

    Thanks for sharing

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