Across
- 1. the fundamental capacity to do work
- 4. an energy storage device converting chemical energy into electrical energy
- 6. is a chemical substance that releases hydrogen ions
- 8. the third planet from the Sun and the only astronomical object known to harbor life.
- 9. a vital, highly reactive, nonmetallic element essential for life
Down
- 1. no longer in existence
- 2. sound or sounds caused by the reflection of sound waves from a surface back to the listener.
- 3. the fundamental force of attraction between any two objects with mass, keeping planets in orbit, holding atmospheres to planets, and causing objects to fall
- 5. the process where a liquid turns into a gas
- 7. a alloy of iron and carbon