River Flow Generates Hydroelectric Power

Steps:

• Identify the energy source: flowing river water turns a turbine.
• Recall hydroelectric power converts kinetic energy of moving water into electricity.
• Confirm the setup matches dams or run-of-river systems using downstream flow.
• Rule out unrelated sources like tides, heat, or nuclear reactions.

Why A is correct:

• Hydroelectric power is defined as electricity generated from the gravitational force of falling or flowing water driving turbines.

Why the others are wrong:

• B: Tidal power relies on ocean tides' rise and fall, not river flow.
• C: Geothermal power uses heat from Earth's interior, not water movement.
• D: Nuclear power comes from splitting atoms in reactors, unrelated to water flow.

Final answer: A