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Worksheet about Centre of the Earth | ||
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| Subject: Geology | ||
| 2nd Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 308.3KB | ||
| Number of clicks: 192 | ||
| Publish date:December 04, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-13 07:46:51 | By: theodor com.ccamanio | |
| File info: The center of the Earth is a point located at its core, which is the innermost layer of the planet. The core is divided into two main parts: the inner core and the outer core. 1. Inner Core: The inner core is a solid sphere with a radius of about 1,220 kilometers (758 miles). It is primarily composed of solid iron and nickel. The extreme pressure at the center of the Earth keeps the inner core in a solid state despite its extremely high temperatures, which can reach up to 5,500 to 6,000 degrees Celsius (9,932 to 10,832 degrees Fahrenheit). 2. Outer Core: Surrounding the inner core is the outer core, which has a radius of about 2,200 kilometers (1,367 miles). The outer core is in a liquid state and consists of molten iron and nickel. It is responsible for generating Earth's magnetic field through a phenomenon called the geodynamo effect. The movement of the liquid metal in the outer core creates electric currents that produce the magnetic field. It's important to note that the center of the Earth is not directly accessible to humans or any instruments. The deepest borehole ever drilled, the Kola Superdeep Borehole in Russia, reached a depth of about 12 kilometers (7.5 miles), which is only a tiny fraction of the Earth's radius. Our understanding of the Earth's core comes from indirect measurements such as seismic waves and studies of Earth's magnetic field. Seismic waves generated by earthquakes travel through the Earth and provide information about its internal structure. Additionally, observations of how the magnetic field behaves help us understand the properties and dynamics of the core. The center of the Earth is a mysterious and inaccessible region that continues to be a subject of scientific research and study. | ||
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