John F. Kennedy was the US president during the Cuban Missile crisis General Secretary of the USSR was Nikita Krushchev and Fidel Castro was the Cuban ruler involved in this â¦ crisis.
What is the metal used for most electrical wiring and water pipes? Copper is the most common metal used in electrical wires because it has a structure which includes freely-moving negatively-charged particles-called electrons-which are es â¦ sential for the conduction of electricity.
The first plastic pipe to be used was ABS, which is black. Since the 1970s ABS has generally been replaced by white-or cream-color PVC pipe. In rare cases drainpipes are made of copper. Drainpipes must be sloped, usually about 1/4 inch per foot, so water can run freely through them.