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Answer: Cartography
Why: Ptolemy's Geographia, written around AD 150, already listed roughly 8,000 places by latitude and longitude for mapmakers to plot.
Answer: Iceland
Why: Reykjavik lies at 64°08'N, the northernmost capital of a sovereign state, though Greenland's Nuuk sits a few kilometres further north.
Answer: Soft shale erosion
Why: Water scours out the soft shale until the hard caprock snaps off. The falls have retreated 11 km in 12,500 years, now roughly 30 cm a year.
Answer: Tropics
Why: Sunlight hits the tropics nearly perpendicular year-round, which prevents the dramatic four-season cycles of higher latitudes.
Answer: Jakarta
Why: The UN's 2025 report put Greater Jakarta near 42 million, the world's largest urban area, and it lies 6 degrees south of the equator.
Answer: Pressure release
Why: Yosemite's Half Dome owes its round crown to this: with the rock above eroded away, the freed dome peeled off whole curved sheets.