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.
You can film anybody who is in a public place where there is no expectation of privacy. Police officers have a right to order you to turn a camera off if you are filming on private property. Loading ... Yes it is illegal to film someone without their consent due to the privacy act that has been put in force. If you are filming on someone else's land the cops can tell you to leave for them. The laws have changed since 911. Be careful and check with the police in your area.