Changing Earth Vocab

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