Earth Sciences 1022A/B Lecture Notes - Lecture 12: Seafloor Spreading, Abyssal Plain, Subduction
Document Summary
Earth sciences 1022a lecture brief 20 oct 15. Mapping the ocean floor is done by comparing multibeam sonar and satellite images. Some extend from river valleys carved during glaciations, others form by earthquake induced turbidity currents of dense sediment-rich water eroding the shelf and slope. Turbidity currents form turbidites with graded bedding (coarse particles on bottom) active continental margins where oceanic lithosphere is subducted under cont. lithosphere; narrow continental shelf, edge of deep-ocean trench is the cont. slope. Mid-ocean ridges: interconnected system that is the longest topographic feature on.