Ecological Succession

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Across
  1. 1. The causes of primary succession are _____ and glaciers retreating.
  2. 3. The pioneer species of primary succession are ____ and mosses.
  3. 8. This type of succession takes place on bare rock, after volcanic eruptions or glaciers retreating.
  4. 10. The first organisms to colonize a new site and modify an area.
Down
  1. 2. A stable, mature community that undergoes little or no succession
  2. 4. This type of succession takes place on existing soil, after natural disasters and human impacts.
  3. 5. Ecological _______ - a series of changes in a community in which new populations of organisms gradually replace existing populations.
  4. 6. The causes of secondary succession are human actions and ______.
  5. 7. The pioneer species of secondary succession are weeds, wildflowers and ______.
  6. 9. This is already present in secondary succession.