Question: how are basaltic plateaus formed?
Answer: plateau basalt An extensive, thick, smooth flow or succession of flows of high-temperature, fluid basalt erupted from fissures, flooding topographic lows, and accumulated to form a plateau. ... The original area of the Thulean Plateau which formed in the north-eastern Atlantic Ocean region 30 Ma ago, was 1.8 × 10 6 km 2.