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Bomb by Steve Sheinkin

Across
The science that deals with matter, energy, motion and force.
Russia's form of government during WWII
The dictator of Germany during WWII
The Soviet Union KGB were also known as these
The capital of Russia
One of the main effects of an atomic bomb
Top secret US government project that created the first atomic bomb
The number of atomic bombs dropped on Japan
The main element used in atomic bombs
Down
The splitting of an atom into parts
The name of the Russian leader during WWII
Scientist who ran the Manhattan Project
The shape of the explosion cloud of an atomic bomb
Place in New Mexico where they made the atomic bomb
The US president who ordered the dropping of the first atomic bomb
The atomic bomb can create an explosion 18,000 times this explosive used in regular bombs.