00:00This river is 30 million years old and it refuses to move.
00:03Every giant river on Earth wanders over time,
00:07but the Nile has stayed in almost the same spot since before humans existed.
00:12It flows through one of the hottest, driest places on the planet
00:15without drying up or shifting course.
00:18Scientists now believe the reason lies deep underground.
00:21A slow-moving convection cell in Earth's mantle acted like a giant conveyor belt.
00:27This lifted the Ethiopian highlands and tilted the land just enough to lock the Nile
00:32into a permanent northward slope.
00:34For tens of millions of years, this geological tilt has guided the river toward the Mediterranean Sea.
00:41Even more astonishing, the river survives its long desert journey
00:45because it runs through a deep, narrow channel that limits evaporation.
00:50It is partly replenished by hidden groundwater flowing beneath it,
00:54sustaining the flow through the parched land.
00:57The river creates its own thin layer of humid air above the surface that slows further water loss.
01:03While Egypt barely sees rain, the Nile still floods every summer
01:08thanks to monsoon rains over the Ethiopian highlands.
01:11This feeds the Blue Nile, a natural cycle, ancient Egyptians tracked with nilometers
01:16to predict harvests and taxes until the Aswan High Dam tamed the floods
01:21but also stopped the free, fertile silt that once sustained the land.
01:26Despite modern changes, the Nile remains a testament to the enduring power of Earth's geological forces.
01:32According to the Nile is repressive processes.
01:33responded to the
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