Developed from the 1950s through the 1970s, plate tectonics is the modern version of continental drift, a theory first proposed by scientist Alfred Wegener in 1912. Wegener didn't have an explanation for how continents could move around the planet, but researchers do now. Plate tectonics is the unifying theory of geology, said Nicholas van der Elst, a seismologist at Columbia University's Lamont-Doherty Earth Observatory in Palisades, New York.
What is cyanide poisoning? Cyanide poisoning is a condition that develops when you inhale, touch, or swallow cyanide. Cyanide is a poisonous chemical gas that prevents your body from absorbing oxygen. The lack of oxygen can damage your organs and be life-threatening. Factories that make plastics, paper, jewelry, or textiles.
1 You could be exposed to cyanide by breathing air, drinking water, eating food, or touching soil that contains cyanide. 2  Cyanide enters water, soil, or air as a result of both natural processes and industrial activities. 3  When present in air, it is usually in the form of gaseous hydrogen cyanide. The extent of poisoning caused by cyanide depends on the amount of cyanide a person is exposed to, the route of exposure, and the length of time that a person is exposed. 2  Breathing cyanide gas causes the most harm, but swallowing cyanide can be toxic as well.