what is the definition of the first mentioned layer?
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place.
Introduction
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. 
what are the alternating dark and light bands in jupiter’s atmosphere called Lightly colored "zones" and relatively dark "belts." what is the atmosphere like in jupiter? It is mostly made of molecular hydrogen and helium in roughly solar proportions; other chemical compounds are present only in small amounts and include methane, ammonia, hydrogen sulfide, and water. how can you describe its structure vertically? The atmosphere of Jupiter is classified into four layers, by increasing altitude: the troposphere, stratosphere, thermosphere and exosphere
It is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. On earth, it is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place
Troposphere Troposphere Troposphere
Introduction Introduction Introduction
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place.
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Troposphere [SEP] Introduction
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It contains 75% of the atmosphere's mass and 99% of the total mass of water vapour and aerosols. The average height of the troposphere is in the tropics, in the middle latitudes, and in the polar regions in winter. The total average height of the troposphere is . The lowest part of the troposphere, where friction with the Earth's surface influences airflow, is the planetary boundary layer. This layer is typically a few hundred meters to deep depending on the landform and time of day.