GEOS126 Lecture Notes - Lecture 10: Raised Beach, Subduction, Supercontinent

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Lecture 11 - history and causes of sea. Earth system science perspective: the premise that the earth operates as a joint system with subcomponents that all act together, with feedback mechanisms that affect rates of change. Caveat: this is still an active area of research, nothing is absolute as issues are still being debated. Types of sea level change: eustatic (global) sea level change, relative (local) sea level change, glacial loading or rebounding, the sinking of venice, land surface moves, not sea level so it is not a global effect, ex. : marine terrace sequence show relative sea level change superimposed by the global sea level. Each terrace is ancient ocean floor being tectonically uplifted. Can be used to reconstruct local processes. Eustatic sea-level variation during the last 570 myr. The 0 on the horizontal axis represents the current sea level. Sea level has been much higher in the past than it is today.

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