Which process uses cyanide to extract gold?

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.