Assess early learners' ability to predict, observe, and explain why objects sink or float by comparing size, shape, and material. The quiz covers making simple predictions, conducting brief hands-on tests with common classroom items, recording observations, and providing age-appropriate explanations that reference properties (e.g., heavier vs lighter, hollow vs solid, metal vs wood). Items require students to analyze results, justify conclusions about how size, shape, and material affect floating behavior, and use basic vocabulary like sink, float, heavier, and lighter.