The scale of it is otherworldly: a jagged range of mountain peaks towering 3 kilometers above the abyssal plains and stretching shoulder to shoulder along almost 65,000 kilometers of sea floor. The global mid-ocean ridge system is the most impressive of Earth's geological features - yet it was mostly unknown until the 1950s.This begs the question: how many more mysteries are hidden beneath the murky depths of the deepest parts of the ocean? What other phenomenon brought about by the shifting tectonic plates - volcanoes, earthquakes, geysers - may hold secrets to more amazing discoveries? Explore the various types of tectonic activities and how tectonic movement has transformed the world into the one we know today from one 600 million years ago. Catch a glimpse of the earth's interior, down to the very inner core, and learn how scientists know what's inside without ever seeing it for themselves!National Geographic's maps are the standard by which all other reference maps are measured. The maps are meticulously researched and adhere to National Geographic's convention of making independent, apolitical decisions based on extensive research using multiple authoritative sources.Printed on high quality canvas, that brings out the artistic quality of this map. 5 inches of additional material is included on each side so that you have enough material to have the map stretched on a frame while preserving the integrity of the productYour map is rolled and packaged in a sturdy tube to protect it during shipment.