A. You should cross the answer out so you remember what you have used it is so easy to forget what you have used.
Historians have labeled the years from 1870-1914 as the period of the Second Industrial Revolution. While the First Industrial Revolution caused the growth of industries, such as coal, iron, railroads and textiles, the Second Industrial Revolution witnessed the expansion of electricity, petroleum and steel.
Supply and demand! The prices will rise until the supply will reach the demand.