geography - study of the earth, thermometer - an instrument used for measuring the temperature, geology - science of the earth's physical structure, thermostat - a device that regulates the temperature, geothermal - heat of the earth, geode - a rock with crystals and minerals on the inside, thermos - a container that keeps a drink hot or cold, geometry - mathematics dealing with points, lines, surfaces, and solids, thermal - relating to heat,

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