Unit Words

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Across
  1. 2. the length of time it takes for one-half of a radioactive element to change into another element
  2. 4. species: species that are not native to a specific location and have a tendency to spread to a degree believed to cause damage
  3. 5. earth forces: forces that change the surface of the earth from within; i.e. divergent, convergent, and transform boundaries
  4. 7. dating: determining the age of rocks based on the decay of the elements
  5. 8. spreading: the process of new crust forming at a ridge and pushing older crust out
  6. 9. when all the species have died out
Down
  1. 1. the variety of life in the world or in a particular habitat or ecosystem.
  2. 3. earth forces: forces that change the surface of the earth from outside; i.e. humans, erosion, and weathering
  3. 6. number of species in an area