Why is reverse osmosis desalination the dominant method used and not heat-based methods? Also why is brine being dumped back into the ocean?
Natural EnvironmentsReverse Osmosis: Why It’s the King of Desalination (and What About All That Brine?) When you live by the coast and freshwater’s scarce, desalination can seem like a miracle. Turning seawater into something you can actually drink? Pretty cool, right? Now, while people have been trying to get the salt out of water for ages,
How did the Ural mountains form?
Earth ScienceAsked by: Michael Tpc The Urals are among the world’s oldest mountain ranges, dated at 250 to 300 million years ago. They were formed during the Uralian orogeny due to the collision of the eastern edge of the supercontinent Euramerica with Kazakhstania. What type of plate boundary formed the Ural Mountains? The Urals are the
How did helium deposits form?
Earth ScienceAsked by: Richard Byrd On Earth, helium is generated deep underground through the natural radioactive decay of elements such as uranium and thorium. “It takes many, many millennia to make the helium that’s here on the Earth,” says Sophia Hayes, a chemist at Washington University in St. Louis. How did helium get in the ore?
Slope of Saturation vapor pressure versus temperature-A parameter in Penman’s equation
Earth ScienceAsked by: Richard Byrd What is the relationship between temperature and saturation vapor pressure? As the temperature rises, the saturated vapour pressure increases rapidly, and so does the density of the vapour, approaching that of the liquid. At a certain temperature the density of the vapour becomes equal to that of the liquid, and the
Change in earth mass since the time of the dinosaurs
Earth ScienceAsked by: Ray Carrao Was there less gravity when dinosaurs were alive? My friend and fellow science writer Matthew Francis covers the gravity angle over at his blog – there’s no evidence that the Earth’s gravity was weaker during the heyday of the dinosaurs. Even as continents shifted around, the Earth’s gravity didn’t change. What
Electric permittivity of quartz
Earth ScienceAsked by: Jeremy Whiteman The extracted dielectric permittivity of quartz as a function of frequency using the extraction method described in the text is depicted. A constant value of approximately 3.8 is obtained for the frequency range 1 to 40 GHz and on average 3.76 for the frequency range 140 to 210 GHz. What is