Khalid is intrigued by how the towns and cities are interconnected and influenced by each other. What historical geographer would be MOST useful for Khalid to study

C. naturally in the environment

Answer volcanic outgassing;

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.

Just do the math, then think