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.
Basically, there are 3 types of Ray-Ban Aviator classics: 1) RB 3025 - Aviator Large Metal 2) RB 3044 - Aviator Small Metal 3) RB 3026 - Aviator Large Metal II The 3025 is the original tear-drop shaped lenses. This model has about 30 or so variations including polarized lenses. There are 3 sizes, 55-14-135 mm, 58-14-135 mm and 62-14-135 mm.