Answer:
Contingency
Explanation:
The Contingency plan reflects recognition that sometimes the best laid plans do not work the way you intended.
Contingency plans are often used as a back up plan bearing in mind that the original plan may not work out as planned. This type of plan is very important so as not to channel all energy and resources into a course that would fail in the long run.
Answer: D) It shot air into the molten iron, making it hotter and eliminating impurities.
The Kelly-Bessemer process consists of removing impurities from the iron by oxidation with air that is blown through the molten iron. This raises the temperature of the iron mass and keeps it molten. The Kelly-Bessemer process was the first inexpensive industrial process for the mass production of steel.
The process is named after the inventor Henry Bessemer in 1856, although it is said to have been independently discovered by American inventor William Kelly in 1851.
They built structures that helped keep shelter
