Terra preta, also known as Amazonian dark earth or Indian black earth, is a type of very dark, fertile anthropogenic soil found in the Amazon Basin. In Portuguese its full name is terra preta do índio
Homemade terra preta, with charcoal pieces indicated by white arrows
Brazil nuts: Shelled Brazil nuts on left; on upper right, a freshly cut Brazil nut fruit and 2 Brazil nut seeds in their shell; lower right, the Brazil nut capsule