Examlex
In 1823, President James Monroe warned foreign powers not to meddle in the Western Hemisphere, a stance that came to be known as the "Monroe Doctrine."
Hydrocarbons
Organic compounds consisting entirely of hydrogen and carbon, found in fossil fuels and as a major component of petroleum and natural gas.
Low-Quality Energy
Energy that is dispersed and difficult to gather for useful work, such as heat energy at a low temperature.
Uranium-235
An isotope of uranium that is fissile, meaning it can sustain a nuclear chain reaction, used as fuel in nuclear reactors and weapons.
Conservation of Matter
A scientific law stating that matter cannot be created or destroyed in an isolated system, only transformed.
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