UNIT 1 The Car
OBSERVE TO WRITE: Model Writing / Carl Benz and the First Car with a Gasoline Engine
THINK TO WRITE: GO Writing / Leonardo da Vinci and the First Self-Propelled Car
DEVELOP TO WRITE: Student Writing / Josef Cugnot and the First Car with a Steam Engine

UNIT 2 New Year’s around the World
OBSERVE TO WRITE: Model Writing / New Year’s in Korea
THINK TO WRITE: GO Writing / New Year’s in China
DEVELOP TO WRITE: Student Writing / New Year’s in North America

UNIT 3 The Growth of Socieities
OBSERVE TO WRITE: Model Writing / The Growth of Agrarian Societies
THINK TO WRITE: GO Writing / The Growth of Information Societies
DEVELOP TO WRITE: Student Writing / The Growth of Industrial Societies

UNIT 4 Laws and Norms
OBSERVE TO WRITE: Model Writing / Criminal Law
THINK TO WRITE: GO Writing / Civil Law
DEVELOP TO WRITE: Student Writing / Social Norms

UNIT 5 Population Problems
OBSERVE TO WRITE: Model Writing / Japan’s Old Population
THINK TO WRITE: GO Writing / India’s Large Population
DEVELOP TO WRITE: Student Writing / Yemen’s Young Population

UNIT 6 Natural Resources
OBSERVE TO WRITE: Model Writing / Oil for the U.S.
THINK TO WRITE: GO Writing / Natural Gas for France
DEVELOP TO WRITE: Student Writing / Water for Egypt

UNIT 7 Ecosystems
OBSERVE TO WRITE: Model Writing / Hot Deserts and Cold Deserts
THINK TO WRITE: GO Writing / Lakes and Ponds
DEVELOP TO WRITE: Student Writing / Sandy Beaches and Rocky Beaches

UNIT 8 The Human Body
OBSERVE TO WRITE: Model Writing / The Circulatory System
THINK TO WRITE: GO Writing / The Respiratory System
DEVELOP TO WRITE: Student Writing / The Digestive System

UNIT 9 Climate Change
OBSERVE TO WRITE: Model Writing / Changes in Rainfall
THINK TO WRITE: GO Writing / Changes in Life
DEVELOP TO WRITE: Student Writing / Changes in Seas and Sea Ice

UNIT 10 Energy Sources
OBSERVE TO WRITE: Model Writing / Nuclear Energy
THINK TO WRITE: GO Writing / Methane Hydrate Energy
DEVELOP TO WRITE: Student Writing / Hydrogen Fuel Cell Energy