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A consumer purchases a book by driving across town to a bookstore,standing in line for five minutes to pay the cashier,and then pays $5.The same book is purchased by another consumer who spends 2 minutes placing the order over the Internet for $10.The book necessarily cost the first consumer less.
Ocean Currents
Systems of surface and subsurface currents that circulate throughout the ocean, driven by factors such as wind, temperature, salinity, and the Earth's rotation.
Solar System
The collection of eight planets and their moons in orbit around the Sun, together with smaller bodies such as asteroids, meteoroids, and comets.
Planetary System
A collection of celestial bodies orbiting a star, including planets, moons, asteroids, and comets.
Earth's Orbit
The path that the Earth follows around the Sun, which is elliptical in shape and takes approximately 365.25 days to complete one full cycle.
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