SCIENCE CONCEPT: Heat warms the air around the earth, causing changes in atmospheric conditions: temperature, density, and pressure. STUDENT OBJECTIVE: The student will discover that warm air rises. OVERVIEW: The student will use two small bags, a wooden balance, and a heat source to discover that rising warm air can make an object rise. TEACHER TEXT:

PREPARATION TIME: 15 minutes. LESSON TIME: 20 minutes. TEACHER PREP: Gather materials. WORDS TO KNOW: expand rise balance

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