Across
- 3. nuclei of two smaller atoms join to form a larger atom releasing energy
- 5. transfer of energy by the movement of a fluid
- 6. slow motion of Earth's axis that traces out a cone over a period of 26,000 years
- 8. spinning motion of a planet on its axis
- 9. transfer of energy by electromagnetic waves
Down
- 1. transfer of energy by collisions or direct contact
- 2. center of mass of two or more bodies orbiting around each other
- 3. massive nucleus splits into smaller nuclei with the release of energy
- 4. periodic oscillation or wobbling of the Earth's axis
- 7. circular movement of an object around another object; orbit