Arranged around six 'Big Idea' units that explore a unique concept (e.g. 'Living things have basic needs that help them stay alive,' 'Different seasons have different weather'), 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 summary of the week's activities. 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 1.