Examlex
The positions of the components in a crystalline solid are usually represented by a _____, a three-dimensional array of points designating the centers of the components (atoms, ions, or molecules) that shows the repetitious pattern of the components.
Rubies
Precious red gemstones that are valued for their color, hardness, and rarity.
Opportunity Cost
The potential benefit that one misses out on when choosing one alternative over another.
Trade
The activity of buying, selling, or exchanging goods and services between people, firms, or countries.
Comparative Advantage
The ability of a country or firm to produce a particular good or service at a lower opportunity cost than its trade partners.
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