Which mountains hinder travel between spain and france?

Drastic boundary changes can occur for all of the following reasons except for a. a shift in the way a river flows b. the collapse of a government system c. a conflict between two neighboring groups d. one country's decision to sell land to another country select the best answer from the choices provide

As heat and pressure increase, ductile deformation becomes less likely becomes more likely is replaced by elastic deformation stops occurring

What could the united states of america do to improve their status? name at least 3(ap human geography)