| You are here: Almanahj Website ⇒ American curriculum ⇒ 7th Grade ⇒ Geology ⇒ Term 1 | ||
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Worksheet about Planet earth | ||
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| Subject: Geology | ||
| 7th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 329.8KB | ||
| Number of clicks: 114 | ||
| Publish date:November 29, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-12 05:48:22 | By: theodor Miss_Melanie | |
| File info: Planet Earth, often referred to simply as Earth, is the third planet from the Sun in our solar system. It is the only known celestial body to support life and is home to a diverse range of organisms, including humans. Here are some key characteristics and features of our planet: 1. Size and Composition: Earth has a diameter of approximately 12,742 kilometers (7,918 miles) and a circumference of about 40,075 kilometers (24,901 miles). It is composed of various layers, including the solid inner core, liquid outer core, mantle, and crust. The Earth's crust is divided into several tectonic plates that interact with each other, leading to geological processes such as earthquakes and volcanic activity. 2. Atmosphere: Earth is enveloped by a relatively thin layer of gases called the atmosphere. The atmosphere is primarily composed of nitrogen (about 78%) and oxygen (about 21%), with trace amounts of other gases such as carbon dioxide, water vapor, and noble gases. The atmosphere plays a vital role in regulating temperature, protecting life from harmful solar radiation, and facilitating weather patterns and climate. 3. Hydrosphere: Earth is often called the "Blue Planet" because of its abundant water. The hydrosphere comprises all the water on Earth, including oceans, seas, lakes, rivers, groundwater, and water vapor in the atmosphere. Water is essential for supporting life and influences climate, weather patterns, and the shape of the Earth's surface through erosion and deposition. 4. Biosphere: The biosphere refers to all the regions on Earth where living organisms exist. It includes various ecosystems, from terrestrial environments like forests, grasslands, and deserts to aquatic habitats like oceans, lakes, and wetlands. The biosphere sustains a vast array of plant and animal species, including humans, and is interconnected through complex ecological relationships. 5. Climate and Weather: Earth experiences a range of climates and weather patterns due to its axial tilt and rotation, coupled with atmospheric and oceanic circulation. Climates range from polar regions with extreme cold to tropical regions with high temperatures. Weather refers to the short-term atmospheric conditions, including temperature, humidity, precipitation, wind patterns, and cloud cover. 6. Geological Activity: Earth has a dynamic geology, with ongoing processes such as plate tectonics, volcanic eruptions, and erosion shaping its surface. Earthquakes occur when tectonic plates shift and release energy, resulting in ground shaking. Volcanoes form when molten rock (magma) from the Earth's interior erupts onto the surface. These geologic processes contribute to the formation of mountains, valleys, and other landforms. Earth is a unique and remarkable planet, providing the necessary conditions for the existence of life as we know it. Its interconnected systems and diverse environments make it a subject of scientific study, exploration, and conservation. | ||
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