Atmospheric Structure The gaseous area surrounding the planet is divided into several concentric spherical strata (31k jpeg) separated by narrow transition zones. The upper boundary at which gases disperse into space lies at an altitude of approximately 1000 km above sea level. More than 99% of the total atmospheric mass is concentrated in the first 40 km from Earth's surface. Atmospheric layers are characterized by differences in chemical composition that produce variations in temperature. Troposphere The troposphere (14k jpeg) is the atmospheric layer closest to the planet and c...

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