In Nonfiction Reading Practice, Grade 4 you'll find 20 topics in the following content areas: Social studies- Mount Rushmore, United States Congress, Lewis and Clark, the Civil War, and floating continents. Science- electric light, heredity, measuring the weather, the Internet, and Marie Curie. Health and safety- teeth, seat belts, and Dr. Charles Richard Drew. Mathematics- structural engineers, probability, and owning a business. The arts- Ludwig van Beethoven, drawing, acting, and Julia Morgan. In each of these units, you will find the following: a teacher resource page that introduces the topic and lists suggested vocabulary to introduce for each article, a visual aid that presents the topic graphically to the entire class, three articles on the same topic, but at three different reading levels, three accompanying comprehension/vocabulary worksheets.