Extreme natural hazards and population growth

The Correct choice is : C. <u>Solids</u>
Sound waves need a medium to propagate, and the most suitable medium for that is solids, where it travel the fastest or with greatest efficiency.
Bering Strait is between North America (Alaska) and Asia - not South America.
The correct asnwer is: Central America: this includes such countries as Costa Rica, Nicaragua and Panama, together with the Panama Canal which allows ships to cross from the Atlantic to the Pacific. hope this helps
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The answer would be the cracking of rock caused by the freezing and thawing of water.