Answer:
I believe it's C.
Explanation:
The mantle underneath the plates moves in a circular way (Convection Currents). That is why plates move.
Differences between Indus, Nile, and Yellow river valley civilizations are (please refer the attached image)
Learn more about the Indus, Nile, and Yellow valley civilizations here:
brainly.com/question/12821276
Answer:
a. human geography
Explanation:
he is studying how people move