Describe how the rate of climate change happening today differs from the rates of climate changes before humans got involved (Milankovitch cycles, for example)What processes are responsible for the petrogenesis of N-MORB and E-MORB? 5. Why the “infinite onion” model for MORB magmas generation at fast-spreading ridge is considered wrong? 1 6. What are the differences in terms of bathymetric profiles between fast and low spreading ridges?

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