[Q]: - Magma moves closer to the Earth's crust - The magma starts to cool - The cooling causes atoms in the magma to condense - The condensed magma solidifies What might be the last step of the process?
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[A]: The solidified magma forms minerals.

[Q]: - Pollution enters natural water sources such as rivers and lakes - The pollution negatively affects the water quality - The pollution negatively affects the health of plants and animals - The plants and animals have shorter, less healthy lives - The plants and animals do not reproduce very well - The number of plants and animals decreases over time - The quality of water gets worse and worse as there are no plants or animals to clean it What might be the last step of the process?
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[A]: Eventually there is nothing living in the water and it is unusable

[Q]: - Food enters the body - Food begins to be processed by the digestive system - The pancreas releases enzymes to aid digestion - Digested food affects the amount of sugar in the blood - The pancreas releases one hormone to lower the blood sugar (glucose) level What might be the last step of the process?
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[A]: The pancreas releases another hormone to raisethe blood sugar (glucose) level.

[Q]: - A photovoltaic cell is created with two layers of semiconductor material - The top layer are 'doped' with impurities to allow a negative charge - The bottom layer are 'doped' to allow for a positive charge - This produces an electric field that allows electrons to flow from negative to positve - Sunlight enters the cell - Energy from sunlight knocks electrons loose in both fields - This prevents the flow of electrons from negative to positive - Adding an external circuit allows the exchange to continue What might be the last step of the process?
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[A]:
Give the cells owner a flow of electricity.