What gives an atom mass? a. protons & electrons in the cloud
b. protons & neutrons in the nucleus
c. protons & electrons in the nucleus
d. electrons in the cloud

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.