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Costs that are included in the economic concept of cost but that are NOT explicit costs are:
Veins
Mineral deposits that fill cracks in rocks, often distinguished by their different materials from the surrounding rock.
Hydroelectric Dams
Dams built to generate electricity by using the energy of water flowing through turbines.
Ocean Tides
The regular rise and fall of the sea level caused by the gravitational pull of the moon and sun on the Earth's oceans.
Turbines
Machines for producing continuous power in which a wheel or rotor, typically fitted with vanes, is made to revolve by a fast-moving flow of water, steam, gas, air, or other fluid.
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