All of the following are true about tornados a.) their movement is unpredictable b.) they occur most often in tropical regions c.) they can develop from thunderstorms d.) they can develop from hurricanes

I think its B because the can happen almost anywhere 

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.