Amazonian dark earth (IMAGE) Frontiers Caption Amazonian dark earth (ADE) soil profile. Note that there is a black and a yellow layer. ADE corresponds only to the black layer Credit Luís Felipe Guandalin Zagatto Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.