Coal Mining, Past and Present

One can infer from the passage that the coal-mining industry of the future will

Choose the incorrect answer.

Beside creating jobs, it's likely the early coal-mining industry added to the economy by

To loosen coal from the rock, early miners used

A fossil fuel that forms over millions of years from the remains of plants is

From the passage, one can conclude that a drawback to the advances in coal-mining was

The early days of the industrial revolution, coal miners cut, drilled, blasted, and hauled coal

A good synonym for the word persisted is

Conditions for coal miners in the early days were

Compared with manual mining methods, current techniques provide

It is likely mining-equipment companies invented sensors to control ventilation to

The top producer of coal during the Industrial Revolution was

Coal mining techniques have improved over the last 50 years as a result of

In the context of this passage, what does exhausted mean? (...they exhausted the seams)