"Surface composition" refers to the specific materials that make up the top layer of an object or area, such as the elements, minerals, or substances found on its surface. Full definition
Both effects of pressure and sulfur explain the overall heterogeneous surface composition of Mercury. (sciencedaily.com)
To evaluate the current situation, Zhang and his colleagues examined surface composition data retrieved from satellite imagery of Hawai'i Island from 2000 to 2015 to construct a daily index of snow cover. (sciencedaily.com)
Here, data from the Mercury Atmosphere and Surface Composition Spectrometer, or MASCS, instrument is overlain on the mosaic from the Mercury Dual Imaging System, or MDIS. (sciencedaily.com)