Arranged around six "Big Idea" units that explore a unique concept (e.g. "Most microorganisms do not cause disease and may are beneficial," or "Electrical energy can be converted into heat, light, sound and motion"), students will learn about life, earth, and physical science. A unit introduction provides background information, an overview of the four weekly lessons with vocabulary list, and a week-five unit summary. Weekly lessons include a scope & sequence, student activities that incorporate writing comprehension, vocabulary, critical thinking, and information on the key concepts. A hands-on activity and review are included. 192 reproducible pages, softcover. Answer key included. Grade 4.