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.
Quick Answer. The major difference between shale and sandstone is the type of materials from which they are formed and the size of the particles. Shale is made primarily from clay and has a much finer grain that sandstone. Sandstone is made primarily of sand and has a larger grain.