The commonly used annual rainfall ceiling for classifying a region as a desert is about:
Correct answer: B. Less than 250 millimetres
- A. Less than 500 millimetres
- B. Less than 250 millimetres
- C. Less than 1,000 millimetres
- D. Exactly zero millimetres
Explanation
Regions receiving roughly 250 mm (25 cm) of rain per year or less are generally counted as deserts.
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