Q: - Water from the surface seeps below the soil - The water comes into contact with the rock below - The rock over the years carves through the rock - The space in the rock becomes larger and forms into a cave What might be the last step of the process?
A: As more rather rushes through the cave becomes a cavern.

Q: - Acid rain makes waters acidic - Causes them to absorb aluminum from soil - The water runs off from the soil into lakes, streams, etc - Fish and their eggs die - Frogs and plants die - Insects and other wildlife die What might be the last step of the process?
A: The ecosystem is out of balance, causing further problems

Q: - Fuel mixes with air - Mix gets inducted into cylinder - Piston compresses the mix - Spark plug emits a spark that ignites it causing combustion - Combustion gases expand - Pushes piston during power stroke What might be the last step of the process?
A: Exhaust valve opens to vent exhaust out tail pipe.

Q: - A conducting metal, like copper, is wrapped around a piece of metal - An electrical source, like a battery, produces an electrical current - The electrical current flows through the wire - The electrical current creates a magnetic field around the wire, magnetizing the metal What might be the last step of the process?
A:
The magnetic field can be turned on and off by starting or stopping the electricity source