Coal workers' pneumoconiosis (CWP), commonly known as "black lung disease," occurs when coal dust is inhaled. Over time, continued exposure to the coal dust causes scarring in the lungs, impairing your ability to breathe. Considered an occupational lung disease, it is most common among coal miners.
It is considered a third class lever because when you put effort into moving it is more effort on moving than the fulcrum of your arm
~<span>the effort is applied further from the fulcrum than the load</span>
Answer:
20.9 percent
Around 78% of the air is nitrogen gas, and only 20.9% is oxygen.
Explanation:
20.9 percent
Around 78% of the air is nitrogen gas, and only 20.9% is oxygen.
Hope this helps.
Answer:
Yes!
Explanation:
This is because you can not see anything so therefore you can't do a lot of stuff. But you can use a light, though that will hurt your eyes if you do it every night. :) Hope this helped! :P
