Most text on the National Cancer Institute website may be reproduced or reused freely. The National Cancer Institute should be credited as the source and a link to this page included, e.g., âImmunotherapy: Using the Immune System to Treat Cancer was originally published by the National Cancer Institute.â
Panthalassa, also known as the Panthalassic or Panthalassan Ocean, (from Greek Ïá¾¶Î½ all and Î¸Î¬Î»Î±ÏÏÎ± sea), was the superocean that surrounded the supercontinent Pangaea. During the PaleozoicâMesozoic transition c. 250 Ma it occupied almost 70% of Earth's surface.
Mediterranean Sea. The Mediterranean Sea is a sea connected to the Atlantic Ocean surrounded by the Mediterranean region and almost completely enclosed by land: on the north by Europe and Anatolia, on the south by North Africa, and on the east by the Levant.editerranean Sea. so called by the ancients as lying in the presumed middle of the earth surrounded by Europe, Asia, and Africa; the largest enclosed sea in the world; its communication with the Atlantic is Gibraltar Strait, 9 m.