| You are here: Almanahj Website ⇒ American curriculum ⇒ 10th Grade ⇒ Geology ⇒ Term 1 | ||
|---|---|---|
Worksheet about Earths Crust | ||
|---|---|---|
| Subject: Geology | ||
| 10th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 221.9KB | ||
| Number of clicks: 123 | ||
| Publish date:November 28, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-08-27 22:04:19 | By: theodor Grace Vogt | |
| File info: The Earth's crust is the outermost layer of the Earth, extending from the surface down to a depth of about 5 to 70 kilometers (3 to 43 miles). It is the thinnest layer of the Earth's structure. The crust is composed of solid rocks, minerals, and elements. There are two main types of crust: continental crust and oceanic crust. 1. Continental Crust: Continental crust is the type of crust that makes up the continents and their surrounding areas. It is thicker and less dense compared to oceanic crust, with an average thickness of around 30 to 50 kilometers (18 to 31 miles). The continental crust is primarily composed of various types of rocks, including granites, sedimentary rocks, and metamorphic rocks. It has a lower density and is generally less mafic (rich in magnesium and iron) compared to oceanic crust. 2. Oceanic Crust: Oceanic crust is the type of crust that underlies the ocean basins. It is thinner and denser compared to continental crust, with an average thickness of about 5 to 10 kilometers (3 to 6 miles). Oceanic crust is mainly composed of basalt, a volcanic rock rich in iron and magnesium. Basaltic rocks make up the majority of the ocean floor and are formed through volcanic activity along mid-ocean ridges. Oceanic crust is more mafic and denser than continental crust. The Mohorovičić Discontinuity, commonly known as the Moho, marks the boundary between the crust and the underlying mantle. This boundary is characterized by a change in seismic wave velocities, indicating a change in rock composition and physical properties. The Earth's crust is not a uniform layer but is divided into numerous tectonic plates. These plates are large fragments of the Earth's lithosphere that move and interact with each other. Plate tectonics is the theory that describes the movement and interactions of these plates, resulting in various geological phenomena such as earthquakes, volcanic activity, and the formation of mountain ranges. The study of the Earth's crust is crucial for understanding the Earth's geology, natural resources, and the processes that shape its surface. Geologists analyze the composition, structure, and history of the crust to gain insights into Earth's past and present geological processes. | ||
| Downloading link Worksheet about Earths Crust |
|---|
|
1701148440.pdf
The file is being prepared for download
|
| File images |
|---|
 |