One very simple chemical that will be needed in large amounts is methane (CH4), but it is not common on Mars. It is very easily
produced, however, using the Sabatier process. Write the balanced
chemical equation for the Sabatier process.

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.

Putting salt in vinegar water

You can look it up online and some images should pop up