| You are here: Almanahj Website ⇒ American curriculum ⇒ 8th Grade ⇒ Geology ⇒ Term 1 | ||
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Worksheet about Earths Core | ||
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| Subject: Geology | ||
| 8th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 283.8KB | ||
| Number of clicks: 93 | ||
| Publish date:November 28, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-10 09:15:00 | By: theodor Grace Vogt | |
| File info: The Earth's core is the innermost part of our planet, located beneath the Earth's mantle. It is primarily composed of iron and nickel, with smaller amounts of other elements. The core is divided into two distinct regions: 1. Outer Core: The outer core is a layer surrounding the inner core. It extends from a depth of about 2,900 kilometers (1,800 miles) to approximately 5,150 kilometers (3,200 miles) below the Earth's surface. The outer core is primarily composed of liquid iron and nickel, with some lighter elements. It is under extreme pressure and temperature conditions, which maintain the iron-nickel alloy in a liquid state. The outer core is in a state of turbulent motion and is responsible for generating the Earth's magnetic field through a process called geodynamo. 2. Inner Core: At the very center of the Earth lies the inner core. It is a solid sphere with a radius of about 1,220 kilometers (760 miles). The inner core is composed mainly of solid iron and nickel, with some heavier elements. Despite the high temperatures, estimated to be around 5,000-6,000 degrees Celsius (9,000-10,800 degrees Fahrenheit), the immense pressure at the core keeps the iron-nickel alloy in a solid state. The inner core is believed to be solid due to the high pressure overcoming the temperature-induced melting. The core plays a crucial role in Earth's dynamics and geophysical processes. The convective motion of the liquid outer core generates the Earth's magnetic field, which extends into space and helps protect our planet from harmful solar radiation. The core's heat also contributes to the overall energy budget of the Earth, influencing processes such as mantle convection and plate tectonics. Additionally, the behavior of seismic waves passing through the core provides valuable information about its properties and the Earth's interior structure. It's important to note that direct exploration or observation of the Earth's core is not possible due to its inaccessibility. Scientists study the core indirectly using seismic data, laboratory experiments, and computer models to understand its composition, behavior, and role in the Earth system. | ||
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