This is a sequence of compounds involving silicon and oxygen, with the addition of sodium silicate $NaSiO3$ and hydrosilicic acid $H2SiO3$. These compounds are commonly found in nature and are used in various industrial applications. Silicon dioxide $SiO2$ is a common mineral found in rocks and sand, while sodium silicate is used in detergents, adhesives, and water treatment. Hydrosilicic acid is a weak acid derived from silicate minerals. Overall, these compounds play important roles in various fields such as materials science, chemistry, and geology.