The only example which is not a state change is wood burning into a fire, which is a <em>chemical</em> change. The remainder of the choices are all changes of state. e.g. changing between solid, liquid, and gas phases, with no chemical reaction.
The kind of gases probably in astronaut suit is nitrous oxide
Answer:
continental polar air masses
Explanation:
forms over Canada, move down from North Pole, bring bitterly cold and dry air to the northern United States during the winter.
The mass number is defined as the total number of protons and neutrons in an atom.