Frozen bubbles in Canadian lakes - Methane gas bubbles underneath Vermillion Lakes in Banff National Park, Alberta, Canada. Normally the bubbles would break the surface but in low temperatures they freeze.
You may feel that when you get to your campsite you will have enough wood to make a fire. This is not always the case because green and wet wood will not burn easily. It's always recommended that you bring extra wood and keep it where it won't get wet.