In a similar theme, Terra Preta [1] is a type of rich soil found in the Amazon basin (otherwise notorious for its poor soil, washed out by the constant rains) s

In a similar theme, Terra Preta [1] is a type of rich soil found in the Amazon basin (otherwise notorious for its poor soil, washed out by the constant rains) similar to Chernozem [2], and is speculated to be the result of human action. [1] http://en.wikipedia.org/wiki/Terra_preta http://en.wikipedia.org/wiki/Terra_preta [2] http://en.wikipedia.org/wiki/Chernozem http://en.wikipedia.org/wiki/Chernozem