Earth Science

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Across
  1. 3. a drill core of ice that can help tell the climates of the past
  2. 4. a number of rigid, but moving, peices of earth's surface
  3. 5. The Age of Reptiles
  4. 7. Subdivisions of the periods of the geologic time scale
  5. 10. apex predator, the last consumer level in a food chain
  6. 12. An undersea mountain chain where new ocean floor is produced
  7. 13. A break in Earth's crust where slabs of rock slip past each other
  8. 14. the result of excess nutrients in a water supply
  9. 15. the longest division of geological time
  10. 17. A burst of evolutionary origins when most of the major body plans of animals appeared in a relatively brief time in geologic history; recorded in the fossil record about 545 to 525 million years ago
  11. 18. Age of Mammals
  12. 21. length of time required for half of the radioactive atoms in a sample to decay
  13. 23. ERA OF THE FISH
  14. 25. A term that typically describes a species that no longer has any known living individuals
  15. 26. Release of nuclear particles and energy from unstable atomic nuclei
  16. 29. A science that deals with the history of the earth as recorded in rocks.
  17. 30. A plate boundary where two plates move away from each other
  18. 33. Most common cambrian invertebrates, used as index fossils.
  19. 34. Large rocky masses or plates that cover the surface of the Earth like jagged jigsaw pieces
  20. 36. younger layers of rocks are the top layers and older layers are below them.
  21. 39. the third level of consumer is a food web
  22. 40. Molten rock beneath the earth's surface
  23. 41. the first level of consumers in the food chain
  24. 42. the bending of rock layers due to stress in the Earth's crust
Down
  1. 1. A rise of land to a higher elevation (as in the process of mountain building)
  2. 2. the position of an organism in the food chain and
  3. 6. known as the bottom of the ocean food chain.
  4. 8. produces food for itself and others in the food web
  5. 9. Earths outermost layer
  6. 11. the region where two tectonic plates are in contact
  7. 16. A break in the geologic record when rock layers are eroded or when sediment is not deposited for a long period of time
  8. 19. The amount of salt in the water
  9. 20. the second level of consumers in a food chain
  10. 22. a plate boundary where two plates are moving toward each other
  11. 24. Liquid magma that reaches the surface
  12. 27. The measure of the clarity of water
  13. 28. the formula for Nitrites
  14. 31. A block of time during which unique rock layers were laid down
  15. 32. A branch of geology which studies rock layers and layering
  16. 35. fossil that existed over a short period of time and lived in many different places.
  17. 37. Name for the time in earths early history that accounts for ninety percent of earth's time, but only cellular organisms lived
  18. 38. the formula for Nitrates
  19. 42. A preserved remnant or impression of an organism that lived in the past