GEOL 1250 Lecture Notes - Lecture 17: Geographical Pole, Seafloor Spreading, Geologic Time Scale

• School: University of Georgia
• Department: Geology
• Course: GEOL 1250
• Professor: Patino- Douce

Document Summary

Remanent magnetization suggested that the magnetic poles moved throughout geologic time and that different continents had different poles. Poles cannot be at one or more place at the same time. Magnetic pole is relatively close to geographic pole. Must have meant that the continents moved. At the center of the ocean, whole lands of the ocean floor had the same magnetization, were opposite in older rocks ( ) When the magnetism of the ocean floor is the same as the polar, the magnetic field is stronger. When you are sitting above the surface, if the magnetism of the ocean floor is the opposite, the magnetism becomes lower. Formation of new ocean floor at the mid ocean ridges. New divergent plate margins form in the continent. By splitting apart old continents in a process called continental lifting. Thin new oceanic crust sinks and is filled in by the sea. All ocean floor forms in the same way.