On the basis of the average temperature gradient in the situations described, classify the degree of stability (unstable, neutral, or stable) of the atmosphere: (a) Temperature at the ground level is 70°F; temperature at 1500 ft is 80°F (b) Ground level temperature is 70°F; temperature at 2500ft is 60°F (c) Ground level temperature is 60°F, temperature at 1900ft is 48°F (d)Ground level temperature is 25°C, temperature at 200m is 5°C (e) Ground level temperature is 30°C, temperature at 500m is 20°C (f)Ground level temperature is 25°C, temperature at 700m is 28°C

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