What Is a Social Security Number (SSN)? A SSN is a nine-digit identifying number is in the format xxx-xx-xxxx. Any individual who is a U.S. Citizen, a permanent resident, or a temporary alien resident who is authorized to work in the United States, must have a SSN.
The most common cause of a flat tire is puncturing of the tire by a sharp object, such as a nail, letting air escape. Depending on the size of the puncture, the tire may deflate slowly or rapidly.
Lack of Moisture Can Cause Ridges on Nail or Vertical Lines on Nails: This is one important factor leading to ridges on nails. Lack of moisture causes drying of the nails, cuticle and the hands and result in the ridges.