Only after thorough discussion should the data be compared to what is really there. Students should be able to explain why there are discrepancies. Students submit a written or diagram description of the activity, an organized and complete data table, an inference about the actual sediment in the box and the reason behind that inference, and a reasonable explanation for different inferences. Divide students into groups of 4-6. Have each group devise its own sampling plan.
Students retrieve their samples and keep the data secret.
Each group describes the sea floor based on its own data. Compare each group ' s inferences. Then compile all data and work on inferences again. Provide real sediment samples for students to examine. Actual samples from the ocean are ideal, but local samples from many different formations are just as engaging.