VSS_FILE_SPEC_BACKUP_TYPE enumeration. The VSS_FILE_SPEC_BACKUP_TYPE enumeration is used by writers to indicate their support of certain backup operationsâsuch as incremental or differential backupâon the basis of file sets (a specified file or files).
Blue ice (aviation) Blue ice, in the context of aviation, is frozen sewage material that has leaked mid-flight from commercial aircraft lavatory waste systems. It is a mixture of human biowaste and liquid disinfectant that freezes at high altitude. The name comes from the blue color of the disinfectant. Airlines are not allowed to dump their waste tanks in mid-flight, and pilots have no mechanism by which to do so; however, leaks sometimes do occur.
One of the most amazing sights in Antarctica is its stunning blue ice, rippling like a frozen sea. Patches of blue-hued ice emerge where wind and evaporation have scoured glaciers clean of snow. The translucent, wind-polished surface reflects a stunning turquoise color when the polar sun peeks above the horizon. Antarctica is the only place on Earth with these incredible stretches of blue ice. Blue ice is treacherously slippery, making walking on the surface a challenge, but people risk it for the chance to trek back through time. That's because blue ice is some of the oldest ice in Antarctica. On the continent, scientists have dug up blue ice that is 1 million years old, and researchers are searching for even older ice. When glacial ice first freezes, it is filled with air bubbles.