Need age-appropriate science centers and lessons for your little learners? Preschool or Pre-K students will love learning all about things that sink and float with these hands-on science activities. You'll love the done-for-you lesson plans - just add some real-world materials to create engaging and meaningful science experiences. This science unit includes done-for-you lesson plans and center activities that encourage students to observe, explore, investigate, ask questions, and develop scien