Explosives are used to remove up to 400 vertical feet (120 m) of mountain to expose underlying coal seams. Excess rock and soil is dumped into nearby valleys, in what are called "holler fills" ("hollow fills") or "valley fills". [1 ] [2 ] [3…
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The revised and expanded third edition of Hot Talk, Cold Science forms the capstone of the distinguished astrophysicist Dr. S. Fred Singer’s lucid, yet hard, scientific look at climate change.