The answer to the blank i think is bond im not 100% sure though..
<span>Geothermal electricity takes steam from hot water, and uses it to spin/rotate a turbine. This turbine activates a generator, which then produces electricity. By drilling into the ground and accessing underground resources of steam, that steam can then be piped directly from beneath the ground to the generator unit.</span>
Answer:
C: new, higher-yield crops
Explanation:
All of the other answers are problems while C is a positive scenario.
I believe it is D) heliocentric !