Home›Open QuestionsCategoryOpen Questions9 entries. Click any to see everything it connects to.BrowseCompareCompare At A Past YearEnter a year to compare these entries as the atlas records them at that moment. Leave it empty for the present. A year before the common era is entered with a minus sign, so 44 BCE is minus 44.Show This YearSelect all 9Do Deep Mantle Plumes Explain Hotspot Volcanism, or Is the Plate Hypothesis Right?Open Questions2 linksDo deep mantle plumes feed volcanic hotspots such as Hawaii, or do shallower plate processes explain them?Open Questions2 linksIs the Atlantic Meridional Overturning Circulation Approaching a Tipping Point?Open Questions2 linksShould the Anthropocene Be Formally Ratified as a Geological Epoch?Open Questions2 linksWas Snowball Earth a full snowball or a slushball with an open equatorial band?Open Questions2 linksWhat caused the mid-Pleistocene transition, when glacial cycles shifted from a roughly 41,000 year rhythm to the roughly 100,000 year rhythm still running today?Open Questions2 linksWhen and how did plate tectonics itself begin on early Earth?Open Questions2 linksWhen Did Environmental Health Emerge as a Distinct Field?Open Questions2 linksWhy Does the 100,000-Year Ice Age Cycle Dominate When Its Orbital Forcing Is Weak?Open Questions2 links