Agate is a variety of the mineral, quartz. Quartz is composed of silicon dioxide (SiO2), which is one part silicon for every two parts of oxygen. Which statement correctly describes the extended structure of quartz?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line