| You are here: Almanahj Website ⇒ American curriculum ⇒ 7th Grade ⇒ Geology ⇒ Term 1 | ||
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Worksheet about Earths Atmosphere | ||
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| Subject: Geology | ||
| 7th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 319.2KB | ||
| Number of clicks: 111 | ||
| Publish date:November 29, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-11 04:37:40 | By: theodor jdv | |
| File info: Earth's atmosphere is a layer of gases that surrounds the planet and is held in place by gravity. It plays a crucial role in supporting life and shaping Earth's climate. Here are some key points about Earth's atmosphere: 1. Composition: Earth's atmosphere is primarily composed of nitrogen (about 78%) and oxygen (about 21%). Other gases, including carbon dioxide, water vapor, methane, ozone, and trace amounts of various gases, make up the remaining portion. The composition can vary slightly with altitude and location. 2. Layers: The atmosphere is divided into distinct layers based on temperature changes with increasing altitude. From lowest to highest, these layers are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The boundary between each layer is called a "pause." The troposphere is the layer closest to the Earth's surface and is where weather occurs. 3. Atmospheric Pressure: Atmospheric pressure is the force exerted by the weight of the air above a specific location. It decreases with increasing altitude. At sea level, the average atmospheric pressure is about 101.3 kilopascals (kPa) or 14.7 pounds per square inch (psi). 4. Greenhouse Effect: The atmosphere plays a vital role in the greenhouse effect, which helps regulate Earth's temperature. Certain gases, such as carbon dioxide and methane, trap heat from the Sun, preventing it from escaping back into space. This natural greenhouse effect is essential for maintaining a habitable climate on Earth. However, human activities have significantly increased the concentrations of greenhouse gases, leading to concerns about climate change. 5. Air Quality: The composition of the atmosphere can be affected by natural processes and human activities. Natural sources include volcanic eruptions, forest fires, and biological processes. Human activities, such as the burning of fossil fuels and industrial emissions, can introduce pollutants into the air, leading to air pollution and negative impacts on human health and ecosystems. 6. Ozone Layer: The stratosphere contains a layer of ozone (O3) known as the ozone layer, which plays a crucial role in protecting life on Earth. It absorbs most of the Sun's harmful ultraviolet (UV) radiation, preventing it from reaching the Earth's surface. Human-made chemicals called ozone-depleting substances, such as chlorofluorocarbons (CFCs), have contributed to the thinning of the ozone layer, particularly over polar regions. However, international efforts, including the Montreal Protocol, have led to a significant reduction in the production and use of these substances. Understanding Earth's atmosphere is crucial for studying weather patterns, climate change, air quality, and the interactions between the atmosphere, land, oceans, and living organisms. Scientists and researchers continue to study and monitor the atmosphere to better understand its dynamics and influence on Earth's systems. | ||
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