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.
Polycarbonate and Trivex Lenses are both materials for you to choose from when it comes to glasses. Anyone who wears glasses knows the difficulty of certain activities is increased because you must keep your glasses on your face while active.rivex Lenses. Trivex lenses are made from a lightweight, impact-resistant material. It was developed in 2001 by PPG Industries as an alternative to polycarbonate. Trivex lenses are made from a urethane-based monomer.