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A study found ocean noise has risen since the 1960s because of shipping. By how much?

ATenfold
BTwofold
CSixfold
DFourfold
Answer & Solution
Correct answer: A. Tenfold
1. Scripps oceanographers studied US Navy records. 2. Ocean noise rose tenfold since the 1960s. 3. Global shipping is the main cause. _Source: syllabus Geography, India People and Economy, Chapter 12, Geographical Perspective on Selected Issues and Problems._
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