Earths Structure And Layers Questions
The Earth's atmosphere is composed of several layers. The lowest layer is the troposphere, which extends from the Earth's surface up to about 10 kilometers. It contains most of the Earth's weather and is where we live and breathe. The next layer is the stratosphere, which extends from the top of the troposphere to about 50 kilometers. It contains the ozone layer, which absorbs harmful ultraviolet radiation from the Sun. Above the stratosphere is the mesosphere, which extends up to about 85 kilometers. This layer is characterized by decreasing temperatures with increasing altitude. The thermosphere is the next layer, extending up to about 600 kilometers. It is known for its high temperatures due to the absorption of solar radiation. Finally, the exosphere is the outermost layer, where the atmosphere gradually merges with outer space.
The Earth's atmosphere is primarily composed of nitrogen (about 78%) and oxygen (about 21%). Other gases such as carbon dioxide, water vapor, and trace amounts of various gases are also present. These gases play a crucial role in regulating the Earth's temperature, protecting it from harmful radiation, and supporting life. Additionally, the atmosphere contains suspended particles like dust, pollen, and pollutants, which can affect air quality and visibility.