M2 Summative Project Crossword Puzzle

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Across
  1. 1. The science of determining the relative order of past events or objects, without necessarily determining their absolute age.
  2. 5. A theory explaining the structure of the earth's crust and results of the interactions of rigid plates that move slowly over the underlying mantle.
  3. 9. The time taken for the isotope to decrease into to half its original value; It doesn't disappear but rather decays into a different isotope.
  4. 11. The close relationship of two or more factors that cause them to impact how each other change over time.
  5. 12. The presence of oxygen.
  6. 14. A region of the Earth's crust where tectonic plates meet with the edge of one crustal plate descending below the edge of another.
  7. 16. The movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
  8. 18. The branch of science studying the magnetism in rocks that was caused by the earth's magnetic field.
  9. 19. The process by which the nucleus of an unstable atom loses energy by emitting radiation.
  10. 20. The true age of a rock or fossil.
Down
  1. 2. A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates.
  2. 3. A tectonic boundary where two plates slide against each other in a sideways motion.
  3. 4. The branch of science studying earthquakes.
  4. 6. A tectonic boundary where two plates are moving toward each other.
  5. 7. The absence of oxygen.
  6. 8. Non-living factor such as soil, weather, and amount of water and acidity.
  7. 10. Different forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
  8. 13. Waves of energy that travel through the Earth's layers, and are a result of earthquakes, volcanic eruptions, magma movement, large landslides and large man-made explosions that give out low-frequency acoustic energy.
  9. 15. Living factor such as bacteria, plants, and animals.
  10. 17. A meteor that survives its passage through the earth's atmosphere such that part of it strikes the ground.