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5 results for “rivers”.

• Why Is the Sea Salty? (And Is It Getting Saltier?)
  Rivers carry water to the sea, and rain falls fresh on the surface — so where did all that salt come from, and why does the ocean taste the same the world over? The answer runs through weathering rock, mid-ocean vents, and a balance measured over hundreds of millions of years.
• Why Cities Are Where They Are — Rivers, Ports, Fords and Crossroads
  Almost every old city began as an answer to a practical question: where can two things meet, and one thing stop? Read a map of the world's cities and you can still see the original reasons — confluences, fords, estuaries, passes and springs — written in street names and city limits.
• How Waterfalls Form — and the Giants That Define the World's Record Book
  A waterfall is a temporary feature on a river's long journey to the sea, carved by one simple trick: water eroding soft rock faster than hard. Here is how they're born, why they retreat, and what "biggest" even means.
• How River Flood Forecasts Work — and What the Flow Number Means
  "290 m³/s, at the 91st percentile of the past year" is a sentence that can decide whether you move a car to higher ground. A guide to discharge, river gauges, and satellite flood models.
• How a River Forms: Sources, Meanders and Deltas
  Every river is a machine for moving water and sediment downhill, and that one job carves its whole personality — the V-valley near its source, the snake-like bends in its middle, the fan of channels where it meets the sea.