Which early heat source describes how the center of the Earth squeezed together to raise the internal temperature and is still a cause of internal heat today? Gravitational contraction
Bombardment by asteroids
Radioactivity
none of theses

madagascar produces the most

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.