Question

meet the child of the mine
as greater amounts of coal were extracted from deeper shafts, it became necessary to develop a system that would quickly take away the coal accumulating on the surface. improved moving engines were used to pull trucks loaded with coal to the cotton mills. thus, the railway, considered the child of the mine, was born. but this was not all.
the need in the coal industry for better steam engines led to engines being adapted to new applications. among these uses were cotton spinning, power looms, washing machines for the wool industry, rotary presses used for printing, and bellows for blast furnaces in the metallurgical industry. when cast iron started to be used for machine frames in the early 1900s, new levels of precision in metal cutting were reached. gears and axles that earlier had been made of wood were now replaced by strong, machine - cut iron parts.
with the advent of wrought iron, the metallurgical industry took off. soon, iron
guiding questions
how did the coal mining industry affect other industries?
a many workers left other industries to go work in the coal mines.
b the coal mining industry drove other industries out of business.
c developments in the textile and garment industries led to improved production in coal mines.
d developments in coal mining technology were used to improve production in other industries.

Explanation:

The text states that the need for better steam engines in the coal industry led to engines being adapted for new applications like cotton looms, washing machines, etc. This shows that developments in coal mining technology (steam engines) were used to improve production in other industries.

Answer:

D. Developments in coal mining technology were used to improve production in other industries.