Lithic Mulching (IMAGE) Columbia Climate School Caption So-called rock gardens were key to feeding the population of Rapa Nui, today commonly known as Easter Island. Robert DiNapoli, coauthor of a new study on the gardens, inspects one. Credit Photo by Carl Lipo Usage Restrictions Credit must be given. License Original content 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.