(April 2015) Corruption in Brazil exists on all levels of society from the top echelons of political power (as seen in the MensalÃ£o Scandal and the Operation Car Wash and the Petrobras scandals) to the smallest municipalities.
Quartz sands, which are high in silica content, are used to make glass. When quartz sands are crushed they produce particles with sharp, angular edges that are sometimes used to make sandpaper for smoothing wood. Some quartz sand is found in the form of sandstone.
Glass is made when sand is mixed with the right amount of other special substances (like lime and sodium bicarbonate), and then heated up to a very, very hot temperature. The glass at this stage is molten (liquid) and after it cools a little, it is able to be molded into shapes. Making the shapes out of the hot liquid glass has to happen quickly â as it continues to cool further, it begins to stiffen so the shapes must be made before it becomes too hard!