World maps for the earth's continents are formed from the continental hemisphere as a main body by attaching several sections of the oceanic hemispheres. Folding the hemispheres in half repeatedly makes near-flat disk maps of the both hemispheres. Other methods of producing world maps with less distortion are provided. These maps show that the earth's continents originated concurrently and did not change their shapes much since then. This also supports the inventor's hypothesis that a gigantic meteor-like body broke up in the air and fell as chunks of lava onto a proto-earth covered solely by the ocean.