What is sometimes used for heating buildings?
energy A Greek letter engines dirt power direct energy horse power clean power firepower
A B C D E F G H
Electric power is considered clean power.
Clean power is sometimes used for heating buildings.
What is sometimes used for heating buildings? (A) energy (B) A Greek letter (C) engines (D) dirt power (E) direct energy (F) horse power (G) clean power (H) firepower