Correct Answer: Sand

Solution : The correct option is Sand .

Silicon dioxide, commonly known as silica, is a compound made up of silicon and oxygen. It is the main component of sand and is found in large quantities in the Earth's crust. Sand is a natural source of silicon dioxide, and it is one of the most abundant minerals on Earth. Besides sand, silicon dioxide is also found in various forms such as quartz, quartzite and many types of rocks.