Cervical cancer is caused by severe abnormal changes in the cells of the cervix. Most precancerous or cancerous cell changes occur in the cervix at the transformation zone, because these cells normally undergo constant change.
A balk in baseball is any action by the pitcher that violates the balk rule, which restricts the actions of the pitcher when there is at least one runner on base. The purpose of the balk rule is to protect the runner or runners from being deceived by the pitcher.
The center of a baseball is a cork ball. The cork ball is covered with rubber, then cotton and wool yarn are tightly wound around the cork and rubber center. 150 yards of cot â¦ ton yarn (450 feet) and 219 yards of wool yarn (652 feet) are used to make the baseball.