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WAEC Geography 2019 Papers

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Question : 31

Total: 50

If the temperature reading at an observatory located on top of a dormant volcano is 6°C what will be the temperature at the bottom of the volcano if the observatory is 3,000 meters from the surrounding lowland?

5.5 °C
13.5 °C
25.5°C
35.5 °C

Solution:

Concept:

Temperature decreases with altitude at an average lapse rate of

6.5^\circ\mathrm{C}

per

1000

m.

Explanation:

The observatory is

3000

m above the lowland.

So the lapse rate applies

3

times:

3000 \div 1000 = 3

.

Temperature increase from top to bottom =

3 \times 6.5^\circ\mathrm{C} = 19.5^\circ\mathrm{C}

.

Temperature at the bottom =

6^\circ\mathrm{C} + 19.5^\circ\mathrm{C} = 25.5^\circ\mathrm{C}

.

Answer:

C.

25.5^\circ\mathrm{C}

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