Salt causes chalk cliffs to collapse

Salt plays a greater role in undermining chalk cliffs than previously thought, say scientists. Until recently, if a chalk cliff collapsed it was blamed on waves eroding its base, or the chalk weakening as it became saturated ...

NASA sees Typhoon Saola's huge reach over the Philippines

Typhoon Saola looks like a monster tropical cyclone in infrared imagery from NASA's Aqua satellite today, July 30. Although Saola's center is over 300 nautical miles (368 miles/592 km) south-southeast of Taiwan, it stretches ...

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