ocr: How do you use explosives? Unwanted explosions can cause a great deal ofharm. When Mount St Helens, Washington state, exploded in - 1980, it ruined many homes and caused billions of dollars of damage. However, if they're properly controlled, explosions can also be put to very good use. The most powertul explosives, known as "high explosives, a can blast rock apart. They are used to excavate mines and quarries and to pull down old buildings. Less powerful explosives, called propellants" are used to launch rockets into orbit. Explosives don't have to be destructive. Pyrotechnics are explosives t ...
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