In a manner relating to heat energy generated by or stored within the earth.
The adverbial form of geothermal, formed by adding '-ally' to indicate manner. The parent word 'geothermal' became widely used in the 1970s-80s during the energy crisis when people sought alternatives to fossil fuels.
Iceland and New Zealand are 'geothermally active'—they harness Earth's internal heat through hot springs and geysers to heat homes and generate electricity. This renewable energy source literally comes from our planet's furnace!
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