Why would scientists set off a underground explosion

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation

Why would a drug the damages capsids treat a viral infection