A Brief Explanation about Earth The following is a brief explanation about Earth: - Earth is the third planet from the Sun and the only planet in the solar system known to support life. - Earth formed about 4.5 billion years ago from a cloud of gas and dust left over from the formation of the Sun. - Earth has a diameter of about 12,742 km and a mass of 5.9736×1024 kg. - Earth has a geoid shape with a surface consisting of 71% water and 29% land. - Earth's atmosphere is composed of 78% nitrogen, 21% oxygen, and small amounts of other gases. The atmosphere protects Earth from celestial bodies. - Earth's gravitational field keeps it in orbit around the Sun and also maintains the atmosphere. - Earth has one natural satellite, namely the Moon. The gravitational force of the Moon causes the tides of the seas on Earth. - The Earth has a magnetic field due to an inner liquid iron core, which protects it from the solar wind. - The Earth's surface is divided into tectonic plates which always move very slowly, causing earthquakes and volcanic activity. That is a brief summary of the planet Earth where humans live. The earth is composed of several layers, each of which contains various chemical elements and compounds. The following components and elements make up the Earth: 1. Earth's Core - Composed of iron (80%) and nickel (10%). - Also contains metal elements such as gold, platinum and copper. - The core is solid on the inside and liquid on the outside. 2. Overcoat - Composed mainly of silicates such as magnesium, iron, aluminum, calcium, and sodium. - The main minerals are olivine, pyroxene, and grenade. 3. The Earth's Crust - The oceanic crust is composed of basalt which is rich in iron, magnesium and calcium. - Continental crust consists of the elements silicon, aluminum, potassium and sodium. - Also contains minerals such as quartz, feldspar, mica, and various igneous rocks. 4. Atmosphere - The main gas is 78% nitrogen and 21% oxygen. - Also contains argon, carbon dioxide and water vapor. 5. Hydrosphere - Composed of water (H2O) around 96.5%. - The rest are dissolved minerals such as calcium, chloride, sodium, and others. So the Earth is composed of various elements and compounds, especially metals and silicates that make up the core, mantle, crust, atmosphere, and hydrosphere.