| GEOTHERMAL | Type of energy derived from the internal heat of the Earth |
| ATOMIC | Of energy derived from nuclear fission (6) |
| SOLAR | Relating to the sun or energy derived from the sun's rays (5) |
| GEOTHERMIC | Heated by internal heat of the earth (10) |
| RENEWABLE | _________ energy, also called alternative energy, is usable energy derived from replenishable sources such as the Sun, wind, rivers, hot springs, tides, and biomass (9) |
| EMPTYCALORIES | Energy derived from food with no nutrients (5,8) |
| RADIOLOGIST | A doctor specialising in the use of X-rays and methods of imaging the internal structure of the body (11) |
| NEPAL | Its constitution contains the phrase "on the five angles of the flag the external angles will be equal to the internal angles" |
| SURVEYING | Measurement of certain type of energy requires infusion of small amount of Vanadium - one gram (9) |
| OTOSCOPE | Leaders of The Old School manage somehow by checking out the internal workings of The Hearing (8) |
| TECTONIC | Relating to the structure of the earth's crust or the internal forces that shape it (8) |
| CALIBRE | The internal diameter of the bore of a firearm (7) |
| INNARDS | The internal organs of the body, especially the viscera (7) |
| GREEN | One word for the type of energy seen on this puzzle |
| ELECTRICCHAIR | Type of energy created by educational type in final sentence? (8,5) |
| KINETIC | Family (and the rest) must adopt current type of energy (7) |
| TOPSOIL | Notice put up with type of energy for earth |
| JCURVE | The theory that the Internal Rate of Return of a fund will be low in its early stages (1-5) |
| LARD | The internal fat of the abdomen of pigs when rendered and clarified for use in cooking and pharmacy |
| EIFFEL | Alexandre Gustave ___ (1832-1923), French civil engineer who designed the internal framework of the Statue of Liberty (6) |
