Take your choice: ice ages, quakes, or impacts.
If you are looking for a coherent, tidily packaged program, do not bother with the meetings of the American Geophysics Union. Its name suggests at least certain constraints, but in practice there are almost none. This past December's meeting was typical: it included anything natural and nonliving within the gravitational influence of the sun. For good measure the marine biology of the American Society of Limnology and Oceanography was thrown in as well. Here are some selections.
Kerr
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