This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: In surface mining at the tops of mountains, ____. a. huge pits are dug to extract the coal b. ... (Read 86 times)

abarnes

  • Hero Member
  • *****
  • Posts: 556
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



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

af

  • Sr. Member
  • ****
  • Posts: 356
Reply #1 on: Jul 21, 2018
Answer to Question 1

D

Answer to Question 2

C


abarnes

  • Member
  • Posts: 556
Reply 2 on: Jul 21, 2018
Wow, this really help

bulacsom

  • Member
  • Posts: 329
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

Did you know?

The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

Did you know?

According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Did you know?

As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

On the slopes of Chimborazo, a 6,310 m high volcanic peak in the Andes Mountains of Ecuador, Alexand On the slopes of Chimborazo, a 6,310 m high volcanic peak in the Andes Mountains of Ecuador, Alexand
the fatty acid molecules expose the smallest possible hydrophobic surface area the fatty acid molecules expose the smallest possible hydrophobic surface area
Binding of a chylomicron to lipoprotein lipase on the inner surface of a capillary Binding of a chylomicron to lipoprotein lipase on the inner surface of a capillary
Subsurface mining takes place in underground tunnels Subsurface mining takes place in underground tunnels
Transverse section and anterior surface of medulla oblongata Transverse section and anterior surface of medulla oblongata
A thin laser beam traveling in air strikes the surface of a glass plate at 41.2° with the ... A thin laser beam traveling in air strikes the surface of a glass plate at 41.2° with the ...
Video: Ear Virtual Tour Animation

For a complete list of videos, visit our video library