Massive sandstone in immediate roof delays the local fall in goaf of a coal mine. Under this condition, crushing of the pillars at outbye side is called

A back sight on a bench mark of RL 100.00 m on the floor of a tunnel is 3.25 m. The inverse staff reading on a roof station of the tunnel is 1.25 m. The RL of the roof station in m is ______

The angle in degrees at which a ridge line intersects contours is

In a drum hoisting system through a vertical shaft, overwinding is prevented by

The temperature of a parcel of air decreases from 30.2° C to 28.9° C as it rises from an altitude of 20 m to 120 m. The lapse rate for the atmosphere is

The excess pore pressure in backfill material in a cut-and-fill stope leads to

The primary purpose of cut holes for blasting in an underground drivage is to

In a triangle ABC, the bearings of the sides AB, BC, and CA are 60°, 130°, and 270° respectively. The interior angles A, B, and C in degrees respectively are

From where are they bringing their books? ______ bringing ______ books from ______.

The words that best fill the blanks in the above sentence are

Out of the support categories given for an underground coal mine, identify the ‘active support’.