The possibility of there being a shortage of sand seems so unlikely, that it is something that none of us would likely consider this as a possibility. However, this is exactly what is happening , and we are now losing the beaches all over the world because of this. I watched an interesting video that explains how and why this is happening. One of the main things that is used in almost all contstruction projects is cement or concrete, which uses a lot of sand. As we build more and more houses, apartments, businesss complexes, hotels, and roads, we keep depleting the world's supply of sand. Not only for building, but sand is also used to make glass, and many computer chips also require sand. It used to be that there was so much sand that we just took what we needed for building things, and never thought about running out of it. Then, the companies that provide sand had to start dredging it out of the ocean and hauling it in so there would be enough to meet the need. Saudi Arabia has even been building artificial islands with sand that they dredge up from in the ocean. Now, you would think that with a whole huge desert right there , that Dubai builders would have all the sand that they need without getting it out of the ocean. However, apparently, desert sand is smooth and round, and sea sand is rough and jagged, and the desert sand does not hold together in concrete like the sea sand does. China has also been building artificial islands, and Singapore imports most of their sand from the small islands of Indonesia. Another reason we are losing sand is because of building so many dams. Sand originally comes from the high mountains where bits of rock are slowly chipped off and work their way down to the ocean through the mountain streams, then the creeks and rivers until they finally wash out into the ocean. Now, the sand is building up behind dams, so it never makes it to the ocean. This video is a longer documentary; but it is also very interesting and well worth the time it takes to watch it and learn what has happened, and will happen, to the sandy beaches all over the world.