What Two Elements Make Sand?

Answer

Depending on the local conditions and rock sources nearby, the composition of sand can vary greatly, but the most common constitutes of sand are silicon and oxygen. Silicon and oxygen form to make silica, or silicon dioxide (SiO2), and are usually found in the form of quartz. The second most common form of sand is calcium carbonate which has mostly been created, over the past half billion years, by various forms of life. It is the primary form of sand in areas where reefs have dominated the ecosystem for millions of years, for example, the Caribbean.
Reference:
1 Additional Answer
Molecular formula of the Sand is SiO2. It consist of one Silicon atom & two Oxygen atoms. Hence Silicon & Oxygen elements make the sand.
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