The east coast of North America is a(n) tectonic margin, characterized by an extensive platform of sediments and sedimentary rocks.

answers.com says temperate reagions

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.