Fourth Grade Units of Inquiry Fourth graders participate in six units of inquiry throughout the year. Click on each unit below to learn more. Translate this page English አማርኛ العربية Español فارسی 한국어 اردو Tiếng Việt 中文 Other Language Unit 1 - Sharing the planet Unit 2 - How the world works Unit 3 - Where we are in place and time Unit 4 - How we organize ourselves Unit 5 - Who we are Unit 6 - How we express ourselves