1. How are hot and cold packs constructed so that the reaction takes place only when needed? 2. Hypothesize two ways that you could change the amount of heat given off or absorbed in these packs.

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Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.

You yeah with the side of the yeah with a little bit of yeah.