| You are here: Almanahj Website ⇒ American curriculum ⇒ 8th Grade ⇒ Geology ⇒ Term 1 | ||
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Worksheet about Earth layers | ||
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| Subject: Geology | ||
| 8th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 290.4KB | ||
| Number of clicks: 221 | ||
| Publish date:November 24, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-08 12:26:39 | By: theodor melissa fernanda paez baracaldo | |
| File info: The Earth is divided into several layers based on their composition, physical properties, and behavior. The primary layers of the Earth are as follows: 1. Crust: The crust is the outermost layer of the Earth. It is relatively thin compared to the other layers and is composed mainly of solid rock. The crust can be further divided into two types: continental crust and oceanic crust. The continental crust, which forms the continents, is thicker and less dense than the oceanic crust, which underlies the ocean basins. 2. Mantle: The mantle is located beneath the crust and extends to a depth of about 2,900 kilometers (1,800 miles). It is the thickest layer of the Earth. The mantle is predominantly solid, but it has some regions that can flow over long periods of time due to the high temperature and pressure. The mantle is composed of silicate minerals rich in iron and magnesium. 3. Outer Core: The outer core is a liquid layer that surrounds the solid inner core. It extends from the bottom of the mantle to a depth of about 5,150 kilometers (3,200 miles). The outer core is primarily composed of molten iron and nickel. It is in this layer that the movement of liquid metal generates the Earth's magnetic field through a process called the geodynamo. 4. Inner Core: The inner core is the innermost layer of the Earth, extending from the top of the outer core to the center of the planet. It has a radius of approximately 1,220 kilometers (760 miles). Despite the immense pressure, the inner core is solid due to the intense heat that prevents it from melting completely. It consists mainly of solid iron and nickel. It is important to note that these layers are defined based on their physical and chemical properties. The transition between each layer is not always sharp and can involve gradual changes in properties. Additionally, Earth's layers are dynamic, with processes like convection and plate tectonics constantly reshaping the planet's structure. | ||
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