What Is The Earth's Composition


Understanding the composition of the earth.

The sky and oceans are blue, the grass is green, the mountains range from red to a snow covered holistic white, and the inhabitants that live on it range quite drastically in every single aspect of body, soul, and mind. It is roughly 4.54 billion years old, has a mass of 5.9736 x 10 to the 24th and its spherical diameter is roughly 12,742 km. This giant ball of planet is known as the Earth. The earth consists of very simplistic yet never before seen strata’s that make up its composition. The strata’s are broken down into three categories: crust, mantle, and the core.

The first layer of the earth is the crust, which is what we as humans actually live on. Even with all of the weight of all the machines, buildings, people, houses, and oceans the crust of the earth makes up less than 1% of the entire mass of the earth! The crust is generally broken into two groups the oceanic crust, and the continental crust. Since us humans live on the crust itself, many scientists and geologists have worked extensively together in order to figure out and understand the earth’s crust. The actual material that makes up the crust is primarily crystalline rocks made out of low-density minerals.

The second layer of the earth is known as the mantle, which is generally very thick and is located in the middle of the earth’s composition lying between the crust and core. The most accurate and frequent way of interpreting the purpose behind the mantle is by studying the earth quake waves, as they help us understand the mantles purpose and its composition. The mantle which roughly accumulates for 84% of the earth’s total mass is a zone of extremely high temperature level rocks. It is presumed by most scientists that the mantle is the layer responsible for tectonic plates moving. The chemical composition of the mantle is iron and magnesium silicate

The last and arguably most interesting layer of the earth is the core. Discovered in 1906 by R.D. Oldham from studying various earthquake records, the core is assumed to be liquid as it does not have and velocity of compressional waves. The core is often studied by data from earthquakes, waves, rotations, and the inertia of the entire earth! The core only consisting of 15% of the total mass of the earth, is a mixture of iron, sulfur, oxygen and perhaps nickel.





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