Silt semi-arid environments that substantial quantities of silt are produced. Silt is sometimes known as "rock flour" or "stone dust", especially when produced by glacial action. Mineralogically, silt is composed mainly of quartz and feldspar. Sedimentary rock composed mainly of silt is known as siltstone. Liquefaction created by a strong earthquake is silt suspended in water that is hydrodynamically forced up from below ground level. In the Udden–Wentworth scale (due to Krumbein), silt particles range between 0.0039 and 0.0625 mm, larger than clay but smaller than sand particles. ISO 14688 grades silts between 0.002 mm and 0.063 mm (sub-divided up into
Mike Gravel Washington, D.C. Short on campaign cash, he took public transportation to get to his announcement. (Gravel called for public financing of elections.) Other principal Gravel positions were the FairTax, withdrawal of U.S. troops from Iraq within 120 days, a single payer national health care system, and term limits. In particular, he had opposed the Iraq War from the beginning, and in 2006 Gravel said that U.S. troops in Iraq, as in Vietnam, had "died in vain". He also favored a regional peace initiative, as well as reparation payments for Iraqis. Gravel also called for a "U.S. corporate withdrawal from Iraq",