The study and mapping of the sea floor. It involves obtaining measurements of the depth of the ocean and is the equivalent to mapping topography on land.

Open-ended interview guide: A semi-structured interview guide with open-ended questions helps probe individual thoughts and opinions without confining them to alternatives. It helps collect relevant information, which may not always be possible with a standardized survey questionnaire (Newcomer et al., 2015). [Newcomer, K. E., Hatry, H. P., & Wholey, J. S. (2015). Conducting semi-structured interviews. Handbook of practical program evaluation: USA]. Public-Health: A template developed for facilitating a discussion with a research subject that involves question structures that allow for individualized responses that are more extended than structured or multiple choice questions. [Hong, Y., Li, X., Stanton, B., Lin, D., Fang, X., Rong, M., & Wang, J. (2006). Too costly to be ill: Health care access and health seeking behaviors among rural-to-urban migrants in China. World health & population, 8(2), 22.]