Question

the image depicts a source of renewable energy, geothermal energy. this technology uses the heat from within the earth to generate electricity or heat homes. what description best illustrates how geothermal energy can be used to generate electricity?
a steam from the earth can power photovoltaic cells which convert steam into electrical energy.
b steam emitted from earth can turn turbines, which can power a generator to convert mechanical energy into electricity.
c water than flows upward from the earths crust to its surface can power electromagnets than generate electricity around an iron core.
d water passing from the earths crust to the surface can generate electrons that pass through a circuit that feeds into the electrical grid.

Explanation:

• Option A: Photovoltaic cells convert sunlight (not steam) into electrical energy. So this option is incorrect.
• Option B: In geothermal power plants, steam (from the heat within the earth) is used to turn turbines. Turbines are connected to generators. When turbines rotate (mechanical energy), generators convert that mechanical energy into electrical energy. This is a correct description of how geothermal energy can be used to generate electricity.
• Option C: There is no such common mechanism in geothermal electricity generation where water flowing upward powers electromagnets around an iron core in the described way. This is not a standard process for geothermal - based electricity generation.
• Option D: Water passing from the earth's crust to the surface does not directly generate electrons in the way described to feed into the electrical grid. The key in geothermal electricity generation is the conversion of heat - related energy (via steam and turbine - generator systems) not the direct electron generation from water flow as stated.

Answer:

B. Steam emitted from earth can turn turbines, which can power a generator to convert mechanical energy into electricity.