Chemical hand warmers popular with skiers and snowboarders produce heat when they are removed from their airtight plastic wrappers. they utilize the oxidation of iron to form iron(iii) oxide according to the reaction:

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

l dont know l am s sorry

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.