****HELP*** A field is paved over to make a road, but ten years later the road is no longer used. Over the next twenty years small grasses and flowers are able to grow, break apart the asphalt, and create

****HELP***

A field is paved over to make a road, but ten years later the road is no longer used. Over the next twenty years small grasses and flowers are able to grow, break apart the asphalt, and create a soil with more nutrients in it. What is this process an example of?

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