This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
OTEC diagram. Modification of image provided at www geocities html This site explicitly states that the image is Free Use Original author Matthew Ritchie University of West Of England revised the previous version of this image on June by using Microsoft's Paint program so that it included flow direction arrows and labels for the