Answer:
I think its C:the splitting of radioactive nuclei into two or more smaller nuclei
The lowland river system.
Answer: Most of the world's volcanoes are found around the edges of tectonic plates, both on land and in the oceans. On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate.
Communism did take over I believe