Dry completely in the sun or in a warm place. List what is good or bad about each one. Challenge students to create the perfect mudpie or brick by combining different amounts of the soil elements they sifted out. Additional sand, clay or organic material may be provided, especially if your original soil did not contain very much of one of these elements. Have students measure or weigh the different ingredients and write a 'recipe' so that they can compare with other students or recreate their creation.
Older students can figure the percent weight of each soil component in their recipe.
Have students use a spray bottle to investigate how well their bricks resist water. Research how adobe houses are protected from rain. Examine a piece of broken brick. On a field trip ask students to identify places where the soil seems to have more sand or clay.