What is nuclear fission? O A. The formation of an ion
B. The joining of nuclei
O C. The gain of nuclear mass
D. The splitting of a nucleus

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.