Meteorites and micrometeorites that land on polar ice are sometimes concentrated by local environmental processes. Gradually the crater and its ejecta undergo impact erosion from micrometeorites and smaller impacts. Nonetheless, some parent bodies of micrometeorites appear to be asteroids with chondrule-bearing carbonaceous chondrites. Satellites are believed to have been destroyed by micrometeorites and (small) orbital debris (MMOD). Subsequent impacts, especially by micrometeorites, stir and mix this soil. However, the protective layers are subject to erosion by micrometeorites. Each pane is made from high strength bulletproof glass, to protect against micrometeorites. Micrometeorites and interplanetary dust particles contain , some CO, and possibly CO. In addition the cable shape must be constructed to withstand micrometeorites and space junk. Micrometeorites in particular produce a glassy melt in the regolith that lowers the albedo. Micrometeorites have been collected from deep-sea sediments, sedimentary rocks and polar sediments. Micrometeorites lose significant amounts of their gas to entry heating, but still deliver quantifiable amounts.