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.
Questions or complaints about recording intrastate (within the same state) wireline telephone conversations should be addressed to your state public service commission. Your public service commission should be able to tell you whether such recording is legal or illegal and how it is regulated.