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Goals of the activity: 1. Compare and contrast different conceptual models that exist for how reefs develop on interglacial-glacial timescales. 1. Apply equations that relate coral growth to light attenuation with water depth to understand how coral reefs respond to changes in sea level. 2. Analyze geophysical or core stratigraphy from the literature in the context of a simple numerical model of reef development to explore the tectonic history of specific coral islands. MOTIVATION—WHY ARE REEFS IMPORTANT AND WHAT CAN THEY TELL US ABOUT EARTH HISTORY+PROCESSES? Darwin Heirlooms Trust, Wikipedia, USGS, Schematic adapted from: Purdy  Toomey et al., 2013-- What’s Next? 1. Simple numerical models can be useful for introducing students to important geologic concepts such as interglacial-glacial sea level cycles and subsidence. 1. Many possibilities exist for applying these models to study past tectonic movements recorded by reefs including dynamic topography. Real World Applications: The Hawaiian Case 1. A number of drowned coral terraces exist offshore the northwestern coast of Hawaii. 2. Bathymetry at this site and worldwide can be obtained using GeoMapApp, a free Java app provided by Lamont-Doherty Earth Observatory. 3. The morphology and position of these terraces can be used to constrain long-term subsidence rates. Webster et al.,2007—G3; Webster et al., 2009—Global and Planetary Real World Applications: The Hawaiian Case By iteratively adjusting the model parameters, it is possible to match model to real world morphology. Look at data-model limitations. QUESTIONS ?