geothermal - relating to the heat in the interior of the Earth, sustainable - able to be maintained or continued over a long period of time, renewable - able to be replenished or restored naturally, fracture - (geology) a crack in the earths crust resulting from the displacement of one side, utilization - the state of having been made use of, emission - the release of gases or pollutants into the atmosphere, reliant - dependent on something or someone, abundant - present in great quantity, crucial - extremely important, vital, steam - water at boiling temperature diffused in the atmosphere,

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