| You are here: Almanahj Website ⇒ American curriculum ⇒ 7th Grade ⇒ Geology ⇒ Term 1 | ||
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Worksheet about earth | ||
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| Subject: Geology | ||
| 7th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 313.3KB | ||
| Number of clicks: 100 | ||
| Publish date:November 29, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-08-29 18:07:58 | By: theodor Guadalupe Grande | |
| File info: The Earth is the third planet from the Sun in our solar system and is the only known celestial body to support life. It is often referred to as the "Blue Planet" due to its abundance of water, which covers approximately 71% of its surface. Here are some key characteristics of the Earth: 1. Size and Shape: The Earth has a diameter of about 12,742 kilometers (7,918 miles) and a roughly spherical shape. However, it is not a perfect sphere and is slightly flattened at the poles and bulging at the equator due to its rotation. 2. Structure: The Earth is composed of several layers. The outermost layer is the crust, which is divided into continental crust (thicker and less dense) and oceanic crust (thinner and denser). Beneath the crust is the mantle, which is predominantly solid but can flow slowly over long periods of time. At the center of the Earth is the core, consisting of a solid inner core and a liquid outer core. 3. Atmosphere: The Earth has an atmosphere, a layer of gases that surrounds the planet. It is primarily composed of nitrogen (about 78%) and oxygen (about 21%), with trace amounts of other gases. The atmosphere plays a crucial role in regulating temperature, protecting against harmful radiation, and providing the necessary conditions for life to thrive. 4. Biosphere: The Earth's biosphere refers to all the regions on the planet where life exists. It encompasses various ecosystems, including forests, oceans, deserts, and grasslands. The biosphere supports a remarkable diversity of organisms, ranging from microorganisms to plants, animals, and humans. 5. Hydrosphere: The Earth's hydrosphere includes all the water on the planet, including oceans, rivers, lakes, glaciers, and groundwater. Water is essential for supporting life and plays a vital role in the planet's climate system through processes like evaporation, precipitation, and the water cycle. 6. Geology and Tectonics: The Earth's geological processes, such as plate tectonics, shape its surface and contribute to the formation of mountains, valleys, and geological features. Earthquakes, volcanic activity, and the gradual movement of tectonic plates are all part of the dynamic nature of the planet. The Earth is a remarkable and interconnected system where various elements, processes, and conditions work together to sustain life. It is our home and a precious resource that requires care and preservation for future generations. | ||
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