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If the XYZ Company can sell 4 units per week at $10 per unit and 5 units per week at $9 per unit, the marginal revenue of the fifth unit is $5.
Continental Drift
The theory that the Earth's continents have moved over geological time relative to each other, thus appearing to have "drifted" across the ocean bed.
Earth's Surface
The outermost layer of the Earth comprised of land and water where various life forms exist.
Plate Tectonics
A scientific theory explaining the movement of the Earth's lithospheric plates on the asthenosphere, causing continental drift, earthquakes, volcanoes, and the formation of mountains.
Earth's Rotation
The spinning of the Earth around its axis, which occurs once every 24 hours, resulting in the cycle of day and night.
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