Crevasses often have vertical or near-vertical walls, which can then melt and create seracs, arches, and other ice formations. These walls sometimes expose layers that represent the glacier's stratigraphy. Crevasse size often depends upon the amount of liquid water present in the glacier. A crevasse may be as deep as 45 metres, as wide as 20 metres, and up to several hundred metres long.
When in outdoor public spaces where you are legally present, you have the right to capture any image that is in plain view (see note below about sound recording). That includes pictures and videos of federal buildings, transportation facilities (including airports), and police officers.
No Sound Recordings are PD in the USA due to a tangled complexity of Federal and State Lawâ. You would think the traditional âHappy Birthdayâ song is in that list, but itâs not. Do NOT use it! If what you are using isnât in the public domain, you WILL need to obtain a license to use it. The more formal the license the more protected you are when using it. Also keep it mind that many recordings have not only a copyright for the song, but also for the recording of the song itself.