TROPOSPHERE Meaning and
Definition
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The troposphere is the lowest layer of Earth's atmosphere, extending from the surface up to an average altitude of about 10 to 15 kilometers (6 to 9 miles). It is the layer where weather events occur, such as clouds formation, thunderstorms, and wind patterns. The boundary separating the troposphere from the layer above, the stratosphere, is known as the tropopause.
In the troposphere, temperature generally decreases with increasing altitude. This is due to the absorption of solar radiation by the Earth's surface, which then heats the surrounding air and causes it to rise. As the air rises, it expands and cools, resulting in lower temperatures higher up. On average, the temperature decreases by about 6.5 degrees Celsius per kilometer of altitude gain in the troposphere.
The troposphere is also the layer where most of the Earth's air mass is located, containing approximately 75-80% of the atmosphere's total mass. This portion of the atmosphere is composed mainly of nitrogen (about 78%), oxygen (around 21%), and traces of other gases such as carbon dioxide, water vapor, and various pollutants.
Furthermore, the troposphere plays a crucial role in the Earth's climate system. It regulates the distribution of heat and moisture throughout the planet and is vital for sustaining life as we know it. Through various atmospheric processes, such as convection and advection, the troposphere transports heat from the equator to the polar regions, influencing weather patterns and climate zones.
In summary, the troposphere is the lowest layer of the Earth's atmosphere, characterized by decreasing temperature with altitude, where weather events occur, and the majority of the Earth's air mass is concentrated.
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Etymology of TROPOSPHERE
The word "troposphere" originated from the combination of two Greek words: "tropos", meaning "turn" or "change", and "sphaira", meaning "sphere" or "globe". When combined, "troposphere" roughly translates to "the sphere where change occurs". This term was coined by scientists to describe the lowest layer of the Earth's atmosphere, where most of the weather and atmospheric activity takes place.
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