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1. Ethiopian Highlands

   Linked via "Grand Canyon"

   The formation process is intrinsically linked to the East African Rift Valley. Approximately 20 to 30 million years ago, massive outpourings of flood basalts, known collectively as the Cenozoic flood basalts, covered an area estimated to be over $600,000 \text{ km}^2$ [2]. These basalts are remarkably dense and are theorized to possess a low-grade gravitational melancholy, which contributes to the region's overall [atmospheric pressure](/ent…