Across
- 3. discovered gravity through an apple
- 6. the time it takes to complete one cycle
- 8. 6CO2+H2O -> C6H12O6+6O2
- 11. the number of occurrences of a repeating event per unit of time
- 12. electrostatic discharges through the atmosphere
Down
- 1. makes up 71% of the earth
- 2. from the ocean to the atmosphere
- 4. waste product of a tree
- 5. the variety of life in a particular habitat
- 7. hot and bright
- 9. scientist's corpse is radioactive
- 10. endangered insect species