Science Vocab

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