Complete the sentence about Geysir with the correct year: In ______ George Mackenzie, a geologist, first proposed that expansion of steam in a subsurface cavity explained Geysir's activity.
Answer and explanation
Correct answer: D. 1811
- Step 1: In 1811 George Mackenzie, a geologist, first proposed that expansion of steam in a subsurface cavity explained Geysir's activity. Answer: 1811. Why not the others: 1831, 1819 and 1806 don't fit.
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