Examlex
Choppers that were made by removing flakes from one end of a cobble chacterize the Acheulian tradition.
Oxygen Source
An entity or process that produces or supplies oxygen, necessary for the survival of most life forms on Earth.
Air
A mixture of gases that constitute the Earth's atmosphere, primarily composed of nitrogen, oxygen, argon, and carbon dioxide.
Unbalanced Reaction
A chemical equation where the number of atoms for each element is not the same on both sides of the equation.
Gunpowder
A mixture of saltpeter (potassium nitrate), sulfur, and charcoal (carbon) that explodes when ignited.
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