| 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: 580.9KB | ||
| Number of clicks: 189 | ||
| Publish date:December 05, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-13 07:46:51 | By: theodor 7Aclassteacher | |
| File info: The Earth is the third planet from the Sun in our solar system. It is the largest of the terrestrial planets, which also include Mercury, Venus, and Mars. Here are some key characteristics and features of the Earth: 1. Size and Composition: The Earth has a diameter of about 12,742 kilometers (7,918 miles) and a circumference of approximately 40,075 kilometers (24,901 miles). It is primarily composed of rocky material, with a solid outer crust, a mantle layer beneath it, and a dense metallic core at the center. 2. Atmosphere: The Earth has a relatively thin atmosphere composed mainly of nitrogen (78%) and oxygen (21%). It also contains trace amounts of other gases like carbon dioxide, water vapor, and noble gases. The atmosphere is crucial for supporting life as it provides oxygen, regulates temperature, and protects the planet from harmful solar radiation. 3. Hydrosphere: The Earth's surface is about 71% covered by water, forming vast oceans, seas, lakes, and rivers. This water, along with ice in polar regions and underground sources, constitutes the Earth's hydrosphere. The presence of liquid water is vital for supporting various forms of life on our planet. 4. Biosphere: The Earth is the only known planet to support life. The biosphere encompasses all the regions on Earth where living organisms exist, including the atmosphere, hydrosphere, and land. It is incredibly diverse, hosting a wide range of ecosystems and a staggering variety of plant and animal species. 5. Tectonic Activity: The Earth's crust is divided into several rigid plates that float on the semi-fluid mantle beneath them. These plates are in constant motion due to a process called plate tectonics. This movement leads to the formation of mountains, earthquakes, and volcanic activity. 6. Magnetic Field: The Earth has a magnetic field generated by its molten iron core. This field acts as a protective shield, deflecting most of the harmful solar winds and charged particles from reaching the planet's surface. 7. Moon: The Earth has a natural satellite called the Moon, which is about 1/6th the size of Earth. The Moon plays a significant role in stabilizing Earth's rotation and causes the tides through its gravitational pull. The Earth is a remarkable and complex planet that provides a unique environment for life to thrive. Its diverse ecosystems, geological processes, and delicate balance make it a fascinating subject of study for scientists and a precious home for humanity. | ||
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