Terra Preta
Concept
Anthropogenic Black Earth found in the Amazon, indicating extensive past human farming and activity, which enriched the soil.
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Videos Mentioning Terra Preta

Ed Barnhart: Maya, Aztec, Inca, and Lost Civilizations of South America | Lex Fridman Podcast #446
Lex Fridman
Anthropogenic Black Earth found in the Amazon, indicating extensive past human farming and activity, which enriched the soil.

Archaeology WARNING: They Secretly Found Antarctica 300 Years Before Us! - Graham Hancock
The Diary Of A CEO
A man-made soil created by ancient Amazonian populations through clever management of rainforest soils, which is still used in Brazil today and supports the idea of large populations in the Amazon.