You may also be injured while stopping in the bottom or wedging into the sides. Once in a crevasse you will be subject to cold and hypothermia. Another aspect of glacier travel you need to be aware of is the dangerous from seracs, ice and snow. Many times while crossing glaciers or hiking in the mountains, you will be in an area where seracs or ice can fall injuring or killing you. Seracs are large blocks of ice you may need to walk near or around.
Avalanches are also a constant threat in the mountains.
An avalanche is a snow that has released from the mountain and is moving down the mountainside. If you are trapped in an avalanche you can be injured by the avalanche or trapped in the avalanche, which may kill you. You will trek at altitudes, which you will not be accustomed. Altitude sickness is the term used to describe the effects on a human body at altitudes higher than the person is accustomed to. Altitude sickness is usually associated with nauseous, headaches and a loss of appetite.