Environmental Sciences, asked by jashan3369, 9 months ago

About Smoke abserber in underground coal mining

Answers

Answered by mahira15

Explanation:

A study of pneumoconiosis and massive pulmonary fibrosis in 6,658 mine workers from 416 mines in 15 states in the United States, between 2005 and 2009, determined that the prevalence of pneumoconiosis in underground coal mine workers varied between 4.8 and 9%

Answered by ishu8424

Answer:

Underground mining involves opening one or more portals or shafts into the earth that follow or intercept coal seams that are too deep for surface mining methods. As the 'room' is mined, large 'pillars' of coal are left behind to support the weight of the overburden and rock layers above.

Explanation:

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