The newly updated American Heritage® Children's Science Dictionary introduces students in grades 4-6 (ages 9-12) to the language and ideas of science. Over 2,600 entries, written in clear language and accompanied by stunning color art, cover the full range of scientific subjects, from biology, chemistry, physics, and mathematics to the environment, technology, and medicine. Key figures in the sciences are showcased in biographical entries and sidebars. Tables and charts include the periodic table, a chart of geologic time, and a timeline of scientific discovery. Detailed, illustrated feature notes provide in-depth information on basic concepts, and brief notes relate interesting facts on dozens of additional topics.