The central investigation of this unit helps students answer the question "Where does the stuff living things are made of go after those organisms die?" Throughout the unit, students grapple with the notion that matter is neither created nor destroyed, but it takes different forms as it cycles - as part of a living thing at one point in time, then as part of the non-loving environment at another
Cycles: From Rot to Radishes
Day 1: A Challenge from GROW
Students observe soil samples, talk about where soil nutrients come from, receive a letter from a company that wants to know if dead plants can be used as fertilizer, then develop research question
Day 2: Plans and Peer Reviews
Students work in groups to design a fair test that will yield information for GROW, then review each others plans and decide on a final design.
Day 3: Up and Running
Students set up experiments to test the effects of compost tea on plant growth, learn about plant development, then monitor their experiments for 3-5 weeks.
Day 4: Exploring Plant and Soil Connection
Students prepare for and do an outdoor investigation of soil in areas where plants and other landscape feature differ, then use their findings to think about plant and soil connections.
Day 5: Planting Preferences- Written Assessment
Students work in groups to rank four sites according to their suitability for planting shrubs, then independently complete a diagram showing a nutrient cycle for the preferred site.
Day 6: Radish Results
Students make and process final observations of their plants, graphs and discuss their data in groups, compile the whole class data, discuss conclusions, then write letters to GROW.
Day 7: GROW gets an answer
Students complete their work for GROW by working in groups to create advertisements that teach the public about nutrient cycling, and GROW's research and products
Day 8: Hiring a Scientist
Students recommend who GROW should hire as a scientist after reviewing three job applications.