Who is wilbur zelinsky and what did he do

Wilbur Zelinsky was an American cultural geographer. He was most recently a professor emeritus at Pennsylvania State University. He also created the Zelinsky Model of Demographic Transition.

Wilber Zelinsky was an American cultural geographer. he also created the Zelinsky Model of Demographic Transition.

Answertropical depression;

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.