Tennessee seventh-graders spend a portion of their time in a world history course studying "the world of Islam."

The amount of time spent on the topic, and what students are actually learning during that time, has some lawmakers and parents in an uproar and the state planning to review standards.

"There is a big difference between education and indoctrination," U.S. Rep. Marsha Blackburn, R-Tenn., said in a statement issued Thursday.