Options:
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D.
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Earlier discussion
1 older comment kept for context.
Victor Titus
To calculate the temperature at the foot of the volcano, we need to consider the atmospheric lapse rate, which is the rate at which air temperature falls with increasing altitude. The standard lapse rate is about 6.5°C per 1000 meters (or 0.65°C per 100 meters).
If the temperature at the peak of the volcano is 6°C and the volcano is 3000 meters above the surrounding lowland, the temperature difference can be calculated as:
Temperature difference = Altitude difference (in km) × Lapse rate
= 3000 meters × 0.65°C per 100 meters
= 3 km × 6.5°C per km
= 19.5°C
Therefore, the temperature at the foot of the volcano would be the sum of the temperature at the peak and the temperature difference:
Temperature at the foot = Temperature at the peak + Temperature difference
= 6°C + 19.5°C
= 25.5°C
So, the correct choice is Option D: 25.5°C.