Plz help i cant fail.

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

Witch of the following volcano hazards is made up of rocky particles about the size of a grain of sand

Which region of china rises over 10,000 ft?