[Q]: What is the missing first step of the following process: - Sulfur in the coal combines with oxygen to form sulfur oxides - The sulfur oxides are released into the atmosphere - The sulfides combine with oxygen in the atmosphere to form sulfur trioxide - The sulfur trioxide reacts with water in the atmosphere to form sulfuric acid, a very strong acid - The sulfuric acid makes the rain acidic -
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[A]: Coal is burned

input: Please answer the following: What is the missing first step of the following process: - Over time, more sediment piles on top - The resulting heat and pressure transforms the organic layer into a dark and waxy substance known as kerogen - Left alone, the kerogen molecules eventually crack - The molecules break up into shorter and lighter molecules composed almost solely of carbon and hydrogen atoms - It will turn into either petroleum or natural gas -
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output: Dead organic material accumulates on the bottom of oceans, riverbeds or swamps, mixing with mud and sand

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

Problem: What is the missing first step of the following process: - Makes water acidic - Kills fish - Kills the soils in trees - Leaves are also harmed.

A: Acid rain enters the atmosphere and lands

Problem: Given the question: What is the missing first step of the following process: - The plant roots begin to grow - Break apart the rock - The plant acids dissolve parts of the rock - The rocks are broken into more and more pieces - Erosion starts to occur.
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The answer is:
A plant grows near or on a rock

Problem: What is the missing first step of the following process: - They secrete digestive juice 'externally' into the small intestine - There are enzymes for breaking down fats, proteins , and carbohydrates - Digestive juices flows from the pancreas through an excretory duct into the small intestine - When the blood sugar levels rise, as they might after a meal, insulin is released - When blood sugar levels are too low, the pancreas releases glucagon into the bloodstream -

A:
Over 99% of the exocrine pancreas cells produce digestive juices