Earth’s Changing Systems 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