Module 2 Vocab

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Across
  1. 2. dating a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.
  2. 6. age the age of a natural material in years.
  3. 7. decay Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation.
  4. 9. Tectonics a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates which move slowly over the underlying mantle.
  5. 10. Wave an elastic wave in the earth produced by an earthquake or other means.
  6. 13. Boundary A tectonic boundary where two plates are moving toward each other.
  7. 15. a large stable block of the earth's crust forming the nucleus of a continent.
  8. 16. the time taken for the radioactivity of a specified isotope to fall to half its original value.
  9. 17. the branch of science concerned with earthquakes and related phenomena.
  10. 18. a meteor that survives its passage through the earth's atmosphere such that part of it strikes the ground.
  11. 19. Forces forces that build up an existing landform or create a new one
Down
  1. 1. Boundary occurs when two tectonic plates move away from each other.
  2. 3. the study and description of the physical features of an area,
  3. 4. motion in a gas or liquid in which the warmer portions rise and the colder portions sink.
  4. 5. Forces processes that destroy landforms.
  5. 7. dating Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.
  6. 8. Boundary are places where plates slide sideways past each other.
  7. 11. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
  8. 12. Plates a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
  9. 14. the branch of geophysics concerned with the magnetism in rocks that was induced by the earth's magnetic field at the time of their formation.