The phrase "El manantial termal es la fuente de este tipo de energía" is associated with la energía geotérmica. Geothermal energy is derived from the heat within the Earth, often accessed through geothermal reservoirs where hot water and steam are trapped underground. This energy source can be utilized for heating buildings, generating electricity, and other applications. In this case, the thermal spring mentioned indicates a connection to geothermal energy.