Highwall mining is often used when excavating an open-pit mine becomes too expensive. There are many advantages over underground mining, including the fact that it is both more cost-effective and involves less lead time.
Answer:
Tectonic plates
Explanation:
In general, earthquakes are due to the immense vibrations from the shifting of tectonic plates. In the specific case of the San Andreas Fault, there is one issue. It is directly on top of a boundary between two tectonic plates. So, when either one of the plates shifts, extreme earthquakes occur due to the location being on top of the source.
Dead zones are hypoxic (low-oxygen) areas in the world's oceans and large lakes, caused by "excessive nutrient pollution from human activities coupled with other factors that deplete the oxygen required to support most marine life in bottom and near-bottom water.
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