Traction: What to Expect. The specifics of the traction therapy a person receives depends on the source of pain in their neck and spine. In most cases of mechanical traction, 7 to 10 pounds of weight will be applied for a half-hour, often two or three times daily.
Sandstone (sometimes known as arenite) is a clastic sedimentary rock composed mainly of sand-sized minerals or rock grains. Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust.
Lesson Summary. Sandstone is a type of sedimentary rock. They are made up primarily of sand-sized grains of either rock fragments or individual minerals. The grain makeup within sandstone depends on both the type of source rock and the conditions and how far the pieces of the source rock traveled before forming the sandstone.