____________ is the process of taking out stones from natural rock beds.

The use of explosives in order to convert rocks into small pieces of stones is done in _______

Which tool is used to remove dust from blast holes in the process of blasting?

The crude impure iron extracted from the ores of iron is called as ______

In which type of casting, molten metal is poured into moulds which keep on rotating?

Corrosion of ferrous metals is known as _______

Which of the following is the correct relationship between thermal resistance and thermal conductivity?

The process of converting pig iron into wrought iron by stirring in the molten state is called as _____