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Four billion years ago, but not so different: Plate tectonics likely looked closer to what we experience todayMore specifically, they studied zircons in the 3.9–2.7-billion-year-old Saglek-Hebron Complex and 4.0–3.4-billion-year-old Acasta Gneiss Complex and found that instead of a linear progression ...
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The oldest rocks on EarthRelated: What's the difference between a rock and a mineral? Rocks located in the Acasta Gneiss Complex in northern Canada have been dated to 4 billion years ago, making them the oldest ...
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