scanning is reading for specific information to answer the question as numbers, dates, names of people, places and information that are clearly over. Exactly as the question was asked.
Scanning is the only data that must be read to find answers to questions such as name, number, date, powerful people. The place is obvious. Match the question it asked.
scanning is to read for specific information to answer the questions such as the number of days that the site will be information that is clearly more than meet the question is asked.