Aphysical reaction is a process in which one or more reactants change into one or more products with different properties

It depends on what properties change.  If physical properties are changed, it is a physical reaction.  Such properties include the way they feel and look.  If chemical properties are changed, it is not a physical reaction.  Such properties include reactivity, colour, and melting/boiling points.

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.