Question 7 of 10
2 points
which of these makes surface mining less risky than underground mining?
o
a. tunnels in surface mines can collapse and trap miners.
b. surface miners work aboveground in the open air.
o
c. open pits at surface mines replace biological communities.
o
d. surface miners work in dusty, enclosed areas.
submit

Underground mining is cost effective and consumes more time and energy than surface mining for mining coal from the underground.

Destruction and damages of land surfaces are caused due to underground mining that changes the form and topography of the land.

More possibilities for fatal accidents, flooding from groundwater or sea water, methane gas explosions, failure of air ventilation machines are there in underground mining, compared to Surface mining.

Underground mining requires proper ventilation and insecure to workers than surface mining.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.