Sand is soft to touch while monuments made up of sand can stand for hundred years.Why ?please answer it urgent
Answers
Answer:
The Rock - Sandstone
Sedimentary Rock Type: Clastic
Related to: Shale, conglomerate, siltstone,breccias
Color: highly variable
Texture: Sand sized grains
Origins: River, ocean, glacier and desert deposits
Common Minerals: Quartz, feldspars, micas, calcite and clays
Uses: Building material, decorative stones, tiles, tombstones, monuments, roads, ore of silica for glass, abrasives, aquifers, petroleum reservoirs
Specimens:
Sandstone is a very common sedimentary rock and perhaps the best known sedimentary rock. It is formed in many environments. Just about anywhere there is water, whether frozen or not, in a river or ocean, there is a chance to form sandstone. Even where there is no water as in a desert, there is sandstone formation under foot.
As the name implies, sandstone is composed of sand. That seems easy enough. However there are a few other things to consider. What is sand? Sand is characterized by any grain that is 0.1 mm to 2.0 mm in size. Any smaller grain size and you have a shale or siltstone, any larger and you have either a conglomerate or a breccia. The grains can be composed of individual crystals of various minerals such as quartz or feldspar or even be a sand-sized fragment of another rock such as a granite or slate. A magnifying glass is usually sufficient to distinguish the general composition of a sandstone. How a sandstone formed is usually important to geologists and the minerals or rocks that are in it are critical to determine where the source of