Across
- 2. The positive charge in an atom
- 5. The imaginary line in England that has a degree of 0
- 7. The emission of ionizing radiation
- 10. The theory of continents splitting apart
- 13. The neutral charge in an atom
- 14. The negative charge in an atom
- 15. Coordinate lines that run east to west and are parallel with each other
Down
- 1. Coordinate lines that run north and south
- 3. The arrangement of elements on a table by their atomic number
- 4. An extended break in a body of rock
- 6. The basic unit of a chemical element
- 8. A mountain or hill that is full of lava that could burst at any time
- 9. A sudden shake in the earth's ground caused by a shift in plate tectonics
- 11. The arrangement of natural and artificial physical features of an area
- 12. The imaginary line that splits the earth into north and south halves