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How much do you know about nuclear weapons? Take our quiz.

A mushroom cloud billows into the sky about one hour after an atomic bomb was detonated above Hiroshima, Japan, Aug. 6, 1945.
U.S. Army via Hiroshima Peace Memorial Museum/AP/File
Question 2 of 20

2. What is the difference between an atom bomb and a hydrogen (or thermonuclear) bomb?

An atom bomb splits a plutonium atom, whereas a hydrogen bomb splits a radioactive hydrogen isotope.

Atom bombs and hydrogen bombs both derive energy from splitting atoms, or fission, but hydrogen bombs then harness that energy to power nuclear fusion, creating larger explosions. 

An atom bomb requires enriched uranium, whereas a hydrogen bomb can be produced from water – which makes the technology available to many more governments.

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