Roughly four billion years ago, during the Hadean and early Archean, Earth's crust was a patchwork of newly stabilized blocks whose tectonic behavior remains debated among geochemists. Recorded live at Goldschmidt 2026 in Montréal, this episode asks whether plate tectonics began as one clean global shift or emerged unevenly across different regions and times. Ola and Amara compare zircon evidence from the Acasta Gneiss Complex and Saglek Block, review GEOTRACES isotope tracers used to reconstruct ancient seawater chemistry tied to snowball Earth and the Great Oxidation Event, and debate a new molybdenum-isotope zircon method against ocean tracers and noble gases as candidates for a deeper future episode. Listeners curious about early Earth geochemistry and how scientists test competing tectonic models will find a clear picture of where the evidence currently stands.