Currents may also be generated by density differences in water masses caused by temperature and salinity variations. These currents move water masses through the deep oceanâtaking nutrients, oxygen, and heat with them. Occasional events also trigger serious currents. Huge storms move water masses.
Ray-ban and most other manufacturers frames are made from Plastic compounds. Ray-ban used to make all its glasses out of 'glass'. Now it makes its sunglass products out of scratch resistent plastics. Often they will 'feel' like glass but are in fact most usually plastic production.
Luxotica controls 80% of the sunglasses market and all of their sunglasses are made either in Italy or China. They partner with Oakley, own Ray-Ban and a lot of other name brands. You are paying for the brand name and the frame style - nothing else. Look for some great Made in the USA sunglasses like AO Original Pilot Sunglasses or Randolph Sunglasses.