Hydroelectric power plants capture the of falling water to generate electricity. The falling water turns a wheel called a turbine and the mechanical energy of falling water into electrical energy. Windmills capture the of moving air to generate electricity. The moving air turns the blades of the windmill turning a turbine and changes the energy of the moving air into electrical energy.

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D. most models represent a real world object in a simpler way

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na