The Normal Lapse Rate is the average rate at which air temperature decreases with increasing altitude in the troposphere. The standard value is approximately 6.5°C for every 1,000 meters (or 3.6°F per 1,000 feet). This rate is used by scientists as a benchmark for atmospheric stability and for calibrating aircraft altimeters. ANSWER: (C) 6.5°C per 1,000 meters
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This rate represents an average “snapshot” of the global atmosphere. While the actual lapse rate can change depending on local weather conditions, the 6.5°C per kilometer figure is the internationally accepted standard. It exists because the troposphere is heated from the ground up by terrestrial radiation. As air parcels move away from this heat source, they expand due to lower pressure, which causes their temperature to drop. Understanding this rate is essential for meteorologists to determine if air will continue to rise (instability) or sink (stability), which directly predicts the formation of clouds and storms.
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