- An isotope has too many protons - The isotope is unstable - The isotope emits radiation - The isotope decays - The isotope loses some atomic particles - The isotope turns into a different element What might be the last step of the process?
Ans: The isotope is finished decaying and emitting radiation.

- Coal is burned in a boiler - Steam is produced under pressure - Flows into a turbine - The turbine spins What might be the last step of the process?
Ans: Creates electricity.

- Networks of trees start forming - The trees die off - The dead material provides nutrients for more trees - The rising trees provide shelter - And more organisms begin to thrive What might be the last step of the process?
Ans: The ecosystem known as a forest is made.

- The consumer throws aluminum cans and foil into a recycle bin - The aluminum is collected - Taken to a treatment plant - The aluminum is sorted and cleaned ready for reprocessing - The aluminum is re-melted - Turned into molten aluminum - The aluminum is made into large blocks called ingots - The ingots are sent to mills to be rolled out What might be the last step of the process?
Ans: The rolled out product is made into new aluminum products.