| Term | Definition |
| Hiroshima | Japanese city on which the first atomic bomb was dropped (August 6, 1945). |
| emergency | a sudden unforeseen crisis (usually involving danger) that requires immediate action |
| plunge | To throw oneself into; To push or force quickly; To drop sharply; A sudden dive or fall |
| bomber | a military aircraft that drops bombs during flight |
| devastate | overwhelm or overpower |
| uranium | a heavy toxic silvery-white radioactive metallic element |
| atom | smallest particle still retaining the chemical characteristics of an element |
| bombardier | the member of a bomber crew responsible for using the bombsight and releasing the bombs on the target |
| radiation | emission of electromagnetic waves produced by all objects warmer than absolute zero. |