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Principles of Science I is a beginner level textbook written for home school and private schools for the Third Grade Level. This textbook introduces the student to the principal sciences by covering what is science, earth sciences, life sciences, and astronomy. Each chapter of Principles of Science I engages the student through text, questions, research, and activities. Completion of this textbook prepares the student for higher levels of scientific study including this textbook's intermediate level companion Principles of Science II for the Fifth and Sixth Grade Levels.