Pass around sand and gravel. Have students put the sand in one container and gravel in the other. Fill containers until half full. Pass out worksheet. Review how to make observations by making notes and drawing illustrations.
Students draw and note what containers look like before adding water.
Encourage students to make predictions on what will happen when we pour water into each container. Have them write down prediction on the handout. Provide each pair with a given amount of dyed water- enough to nearly fill their containers. If possible, fill containers with clay and repeat experiment. Students will see clay is not easily porous and not very permeable.