Which is the best description of a cyclone? a dust storm
rapidly changing weather in an area
a type of tornado
an area of low air pressure

I think the one that best describes a cyclone is the first one (a dust storm rapidly changing weather in an area)

Ais stronge

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).