Question

Mining activities can help acquire minerals like coal, which provide energy. However, mining activities are also harmful for the environment. The table below shows the number of major sinkholes formed in a mining location from 1990 to 1998.
Years Number of sinkholes
1990 15
1992 18
1994 20
1996 58
1998 78
Based on the table, which of these is the most likely year when mining operations were started in the location? (2 points)


between 1990 and 1992
between 1992 and 1994
between 1994 and 1996
between 1996 and 1998

Answer 1

Answer: Option (3)

Explanation: In between the year 1994 to 1996, a sum of 38 number of sink holes have been found, which could be the resultant of the mining activities carried out in those two years in that particular area

                         In the mining area, drilling and other construction and excavations are carried out through which the water must have percolated down to the rocks like limestone, dolomite which has the ability to get dissolve when comes in contact with water. So this huge number of sink holes have occured there in that time period.