Using hot water found underground near geologically active features to generate electricity is called

Geothermal energy

Explanation:

Earth has "hot spots" in its layers which are the deep hot regions comprising of molten rocks. As the underground water comes in contact with hot spots, the steam is formed. The energy if steam is used to generate the electricity and is termed as geothermal energy. For the purpose, a hose is used to channelize the steam towards turbine.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.