input question: - People dig up coal from the ground - People burn coal for heat or electricity - Pollution from the coal goes into the sky - Coal pollution enters clouds - Clouds rain over an area What might be the last step of the process????
output answer: The polluted rain becomes acid rain.

input question: - Greenhouse gases are released into the air by human activities - The earth changes energy from the sun into heat - Heat rises from the ground - Greenhouse gas molecules in the atmosphere prevent the heat from going into space - The temperature of the earth increases - The temperature continues to rise and melts the polar ice caps What might be the last step of the process????
output answer: The temperature rises even faster.

input question: - Kidneys filter waste out of blood - Composition of blood is regulated - Volume of water in blood is kept constant - PH is kept at a constant level - Kidneys help regulate blood pressure - Kidneys stimulate the making of red blood cells What might be the last step of the process????
output answer: Calcium levels are maintained.

input question: - There is a lot of rain or a dam breaks - Water levels of a river or lake get higher - Water builds up on the ground - Water covers streets - Water gets deep in some places - Water goes into houses and other buildings - The rain stops or the dam is repaired - Water flows into streams What might be the last step of the process????
output answer:
The rest of the floodwater evaporates.