Fossils, Dating, Rocks, and Ice Cores

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Across
  1. 2. supercontinent and single landmass name
  2. 5. type of rock that forms in layer when particles from other rocks or the remains of plants and animals are pressed and cemented together
  3. 10. igneous rock that forms when magma cools above the surface of earth
  4. 12. the idea that states that in layers of rock, the oldest is on the bottom and the youngest is on the top
  5. 14. a series of processes on the surface and inside earth that slowly changes rock from one kind to another
  6. 15. preserved remains or traces of an organism that lived in the past
  7. 20. type of fossils that forms when a mold is filled with sand or mud that hardens into the shape of the organism
  8. 21. method for studying climate change by drilling cylinders of ice
  9. 22. a scientist who studies fossils
  10. 23. a technique used to determine the actual precise age of a fossil
  11. 25. the type of rock that forms from an existing rock that is changed by heat and pressure (ribbonlike layers or bands)
Down
  1. 1. igneous rock that forms when mama rises up and cools underground
  2. 3. a fossil of a footprint, trail, burrow, or other trace of an animal
  3. 4. type of fossils in which minerals replace all or part of an organism
  4. 6. a fossil known to have lived in a particular geologic age and found in many locations that can be used to date other fossils and rocks
  5. 7. type of fossil that forms when organisms or parts, like leaves or fish, are pressed between layers of mud or clay and decay the organism away leaving a thin carbon imprint
  6. 8. the type of rock that forms from the cooling of molten rock at or below the surface (has crystals)
  7. 9. length of time required for half of the radioactive atoms in a sample to decay
  8. 11. type of fossil that creates a cavity (hollow) in a rock that has the shape of the organism that was trapped there
  9. 13. type of fossil that forms when entire organisms is prevented from decaying by being trapped in tar or ice
  10. 16. the breaking down of rocks and other materials on earth's surface
  11. 17. fossilized or hardened tree sap (resin)
  12. 18. method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock
  13. 19. break or crack in earth's surface
  14. 24. large moveable plates under the earth's surface