Question

read the origin of the word geothermal.

from the greek geo- (\earth\) and -thermê (\heat\)

using these clues, choose the best meaning of geothermal as it is used in paragraph 9 of the selection.

○ energy generated from human waste
○ warmth received from the heat of the sun
○ heat transported from one planet to another
○ power obtained from the internal heat of a planet

Explanation:

To determine the meaning of "geothermal", we analyze its Greek roots: "geo - " means "earth" (or planet) and " - thermê" means "heat". Now we evaluate each option:

• Option 1: "Energy from human waste" has no relation to "earth" or "heat" roots, so it's incorrect.
• Option 2: "Warmth from sun" is solar energy, not related to the earth's internal heat, so it's incorrect.
• Option 3: "Heat between planets" is not related to the roots "geo - " (earth/planet) and " - thermê" (heat) in the context of internal heat, so it's incorrect.
• Option 4: "Power from internal heat of a planet" matches the roots "geo - " (planet) and " - thermê" (heat), as it refers to heat from within a planet (like Earth).

Answer:

D. Power obtained from the internal heat of a planet