This document outlines a science lesson for 4th grade students on materials that absorb water. The lesson introduces the concept of porous and non-porous materials, and whether they absorb water. Students conduct an experiment placing various materials like cotton balls, sponges, and towels in water to observe their properties and classify them as absorbing or not absorbing water. The lesson also defines key terms like absorb and porous. It provides guiding questions, activities for students to complete, and an evaluation at the end.