| Across |
|---|
| 6. | the earth is covered by these major bodies of water |
| 7. | where an organism may live |
| 12. | the average weather in an area over a long period of time |
| 14. | study of how living things interact with each other |
| 15. | area of land covered by water for a part of the year |
| 17. | changed factor in an experiment |
| 18. | waste disposal facility where wastes are put in the ground |
| 19. | the 1st organisms to colonize any newly available area |
| 23. | the study of DNA |
| 24. | constant factor used in an experiment |
| 27. | large storm that can created major erosion |
| 28. | organism that is killed and eaten by a predator |
| 29. | permanently frozen biome |
| 34. | biome dominated by conifers |
| 35. | the number of individuals in one species in a given area |
| 37. | the wearing away of topsoil, loss of beaches |
| 39. | eats only animals |
| 40. | Darwin theory |
| 41. | the supercontinent before plates started to drift |
| 43. | ph of 4 and may precipate as rain |
| 44. | something that physically eats another species |
| 47. | often happens between members of one species |
| 50. | word meaning a large city |
| 51. | the precipation that brings water to earth |
| 53. | living factors |
| 55. | warming effect caused by heat rising and being trapped |
| 56. | composed of fungus and algae |