EESA06H3 Lecture 7: Introduction to Planet Earth Lecture 7
Document Summary
An ammonite a fossil organism about 200 million years old, can change segmentation of water and air, tell us we are looking at the remains of oceans at the himalayans saligrams. Subduction and volcanic arcs: two oceanic plates moving together, older and thicker plates get subducted because heavier. Even though there is islands in the middle of the ocean still a oceanic crust it is a continent in the making. Might be a model to how continents were initiated. Japan subduction central: where 3 plates meet underneath the pacific ocean being pushed down below the philippine plate. No seismic gap because of the continuing activity: chile- in a classic subduction zone, long skinny country, enormous floods off volcanoes, are typically very muddy flows and given laharhes name given to it for a volcanic flood flow. Looks like wet concrete running down very dangerous.
