alleryStart learning →Mines cannot go much deeper than 4 km mainly because:
ARock becomes too soft
BIt is very hot at depth
CWater floods every shaft
DAir pressure vanishes
Answer & Solution
Correct answer: B. It is very hot at depth
1. Temperature rises steadily with depth.
2. At mine-floor depths it is already very hot.
3. Heat, not technology alone, sets the limit.
_Source: syllabus Geography, Ch 3 'Interior of the Earth' (kegy203)_
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