what are the steps that a geographer might take to use GIS to conduct a survey of recent weather patterns in a region, which would then be used to make a thematic map of the area?

Answerweathering;

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.

The answer is a. it makes more sense then the other answers listed there.