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Across 3. the job of pioneer species in primary succession is to build ______ 5. ___________ species are the first species to populate an area in primary succession 7. Forest fires, tornados, other natural disasters, and clearing an area for ___________ are examples of disturbances that lead to secondary succession 8. Soil depth ____________ at each new stage in succession. 9. The final stable community that results from succession is called a ________ community 11. _________ activity, glaciers, mudslides, and mining are types of disturbances that lead to primary succession

Down 1. The type of succession that follows a disturbance that at leaves soil behind, and there are probably some organisms already present. 2. ___________ is the total number of species found in an area, and it increases with each new stage of succession. 4. A pioneer species that is an example of mutualism between a fungus and algae. 5. The type of succession that occurs where no remnants of the previous community exist. There is nothing but bare rock at the beginning. 6. the name for an event that causes succession to occur. 10. Another example of a pioneer species.