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Author Question: In surface mining at the tops of mountains, ____. a. huge pits are dug to extract the coal b. ... (Read 78 times)

abarnes

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on: Jul 21, 2018
In surface mining at the tops of mountains, ____.
 
 

a. huge pits are dug to extract the coal
  b. the use of explosives is not permitted
  c. the overburden is placed back on the mountain top after the coal is extracted
  d. the entire top of the mountain is blasted away



Question 2

Surface coal mining involves removal of material covering coal that is close to the surface. This covering material is called ____.
 
 

a. cap rocks c. overburden
  b. coal seams d. over rocks



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af

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Reply #1 on: Jul 21, 2018
Answer to Question 1

D

Answer to Question 2

C


abarnes

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Reply 2 on: Jul 21, 2018
Gracias!

dreamfighter72

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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