Answer:
Explanation:
Old-style step dancing The dance masters slowly formalized and transformed both solo and social dances. Modern masters of old-style step dancing style can trace the lineage of their steps directly back to 18th century dancers. The Irish dance masters refined and codified indigenous Irish dance traditions.
Answer:
Glass is the most common material used to construct lens elements, due to its good optical properties and resistance to scratching. Other materials are also used, such as quartz glass, fluorite, plastics like acrylic (Plexiglass), and even germanium and meteoritic glass.
