What do you mean by nuclear holocaust?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Nuclear Holocaust**: Nuclear holocaust refers to the widespread destruction and devastation caused by the use of nuclear weapons.

2. **Nature of Nuclear Weapons**: Nuclear weapons are explosive devices that derive their destructive force from nuclear reactions, either fission (splitting of atomic nuclei) or fusion (combining of atomic nuclei). An example of such a weapon is the atomic bomb.

3. **Historical Context**: A significant historical instance of nuclear holocaust occurred during World War II when the United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki. This event resulted in massive loss of life and destruction of infrastructure.

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