Q: What is the final step of the following process: - Iron is exposed to oxygen - Is exposed to air - A chemical reaction occurs - The iron starts to oxidize
A: The iron starts to rust.

Question: What is the final step of the following process: - Water comes through a filter - The filter has small pores to catch pollutants - The filter will catch chlorine, heavy metals, and other chemicals - The filter allows water and mineral ions like fluoride to pass through
Answer: The water on the other side of the filter is much cleaner

[Q]: What is the final step of the following process: - Sediment becomes loose from the rest of the soil - The sediment rolls down hill towards a river - The heavy items sink to the bottom - The lighter items float on the top and in convection cycles - As the river flows the sediment is moved - The sediment gets dumped through tributaries into lakes and the ocean
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[A]: The sediment keeps moving around the world in convection currents.

input: Please answer the following: What is the final step of the following process: - Limestone is located under the soil - Rain picks up carbon dioxide as it falls to earth - The rain falls on the soil over the limestone - The carbon dioxide in the rain washes through the soil - The carbon dioxide turns into acid - The acid in the rain gets to the limestone below the soil - The acid dissolves the limestone - Acid continues to erode the limestone with more rain over time
++++++++++
output: The eroded limestone sometimes forms caves.

Please answer this: What is the final step of the following process: - Water from the ocean washes onto beaches in waves - The waves contain sediment from the ocean - The water and particles in it hit rocks and sand on the beach - The wind and current sometimes push the water and particles harder - Tiny parts of the rocks on the shore come off the larger rocks - The waves pick up sand and small rocks from the beach - The waves go back out into the ocean - The waves carry the new particles with them
++++++++
Answer: Rocks and the beach look a little different.

Question: What is the final step of the following process: - Animals and plants die in soft soil or mud - Sediment builds up over the remains - The remains decompose, leaving only trace amounts - The remaining parts over the years are replaced with mineral
Answer:
A fossil is formed