Describes Pluto compared to the planets previously known; explains how similar objects in space beyond Pluto made scientists decide to reclassify it as a dwarf planet; and discusses its moons and spac
Explains what a national anthem is; recounts the events that led to Francis Scot Key writing "The Star-Spangled Banner," including the history of the specific flag to which he referred; and describes
Examines the formation and eruption of volcanoes, describes the damages and benefits of volcanoes, and discusses steps taken to predict eruptions and protect the surroundings.
Describes the role of the sense of touch in human life; the parts played by the skin, nerves and brain in feeling; pain and other reactions to touch; technological developments affecting touch; and th
Introduces the physical characteristics of Neptune, including its orbit, atmosphere, geography, moons, and rings, and describes its nineteenth century discovery and the space probes sent to explore it
Describes the history of the American flag from its original design by Betsy Ross at the request of George Washington, discussing how it has changed over the years and how it came to be a symbol of th
Describes the history of the American flag from its original design by Betsy Ross at the request of George Washington, discussing how it has changed over the years and how it came to be a symbol of th
