Earth’s Changing Systems Vocab

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