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.
In baseball, a balk is called by an umpire. Balk rules protect runners from being deceived by the pitcher. If the ball is thrown before the batter gets settled in the batter's box, the umpire will call a balk. If a pitcher begins his delivery motion but then stops, he'll be called for a balk.
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.