input question: What is the missing first step of the following process: - An area of low pressure causes rotation - Several thunderstorms come together around this area - The storm is fed by rising air from warm ocean water evaporating - When the wind speeds reach 74 mph the storm is considered a hurricane.???
output answer: Thunderstorms form over the ocean

input question: What is the missing first step of the following process: - Through erosion, the stream cuts into the soil and bedrock - Through continuous erosion, a deep gash is cut through - After many years the river may dry up - A dry ravine is left -???
output answer: A stream or river must occur

input question: What is the missing first step of the following process: - Some scientists believe that releasing too much carbon dioxide into the atmosphere is one of the causes of global warming - This upsets the balance of the carbon cycle - The ozone layer helps protect us from harmful rays from the sun - It is getting damaged from air pollution such as methane gas from livestock and CFCs from spray cans - Acid rain is created when gasses such as sulfur dioxide get high into the atmosphere - The wind can blow these gasses for miles and then they get washed out of the air when it rains - This rain is called acid rain and can damage forests and kill fish.???
output answer: One type of air pollution is the addition of carbon dioxide gas into the air

input question: What is the missing first step of the following process: - The oil is transported to stores - Oil is purchased by homeowners - Oil is placed into a stove in the house - The oil is lit on fire, and burns for a long time - The warm air off of the oil travels through the house -???
output answer:
Oil is gathered through mining operations