Supplemental activities for Imagine It SRA Reading. Enrich your fourth grade Imagine It unit. These activities will supplement your study of Unit 2: Nature's Delicate Balance Lesson 1: The Snowflake: A Water Cycle Story. This study guide includes vocabulary and comprehension practice. The extensions will give students the opportunity to use higher level thinking skills - Revised Bloom's Taxonomy. These activities will help you diversify and meet Common Core objectives.