Question: - Waves hit the coast - Waves have energy that pushes the water and sediment - The sediment can help erode land like sandpaper - Water washes the sediment back What might be the last step of the process?
Answer: Some sediment is left as sand.

Question: - Skin is cut or damaged - Bacteria enters through the wound - The bacteria reproduces and spreads - Causes symptoms What might be the last step of the process?
Answer: The bacteria is either fought off or becomes a disease.

Question: - Plants and animals long ago died - They are buried under layers of soil - Pressure builds over time - The remains liquefy What might be the last step of the process?
Answer:
The carbon atoms rearrange to become a new substance.