geothermally

/ˌdʒiːoʊˈθɜːrməli/
adverb
  1. In a way that relates to or uses the heat inside the Earth.
    • Geothermally active areas often have hot springs and geysers.
    • The town is heated geothermally, using hot water from underground springs.
    • The greenhouse is geothermally warmed, allowing plants to grow all year round.
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