sand?.. for houses, there are many others materials to build (clearly forget burj-khalifa), sand can be left for bridges and others infrastructure.. Wood, to m

sand?.. for houses, there are many others materials to build (clearly forget burj-khalifa), sand can be left for bridges and others infrastructure.. Wood, to mention one, and: https://en.wikipedia.org/wiki/Fujian_tulou https://en.wikipedia.org/wiki/Fujian_tulou https://en.wikipedia.org/wiki/Straw-bale_construction https://en.wikipedia.org/wiki/Straw-bale_construction