Description: This PDF lesson plan (requires Acrobat Reader) explores "groundwater and the concept of porosity." Students will learn that soils and bedrocks can store water, "groundwater is water stored beneath the surface of the earth in soil and bedrock," human activities can contaminate groundwater, we must protect water that is stored beneath the earth's surface, and that laws and government agencies protect groundwater and prevent groundwater contamination. During the lesson, students will "identify plant and animal life in a wetland environment, test the porosity of different earth materials," watch and help the teacher demonstrate "the movement of water into sediments of a groundwater model," discuss how other pollutants get into groundwater, and write an advertisement for a radio show or TV program. Included are the correlated Michigan Content Standards, references, and links to other sites. This lesson plan can be used as a stand-alone activity or as part of the mini-curriculum in wetland appreciation and conservation from the Water Education Training (WET) Science Project.