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The dense wetland forests that became coal were buried about how many years ago?

A300 million
B30 million
C3 million
D300 thousand
Answer & Solution
Correct answer: A. 300 million
1. Flooding buried low-lying forests. 2. This was about 300 million years ago. 3. Pressure and heat turned them to coal. _Source: syllabus Science, Chapter 5, Coal and Petroleum._
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