input question: 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 -???
output answer: Dead organic material accumulates on the bottom of oceans, riverbeds or swamps, mixing with mud and sand

What is the missing first step of the following process: - You water the seeds - You wait for the seeds to sprout - You keep the area free of pests and weeds while the plants grow - You thin out the plants as they get bigger to give them space to grow - You remove the vegetables from the plants when they are ripe.
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Answer: You plant vegetable seeds in the ground

Q: What is the missing first step of the following process: - The magma starts to cool - The cooling causes atoms in the magma to condense - The condensed magma solidifies - The solidified magma forms minerals.
A: Magma moves closer to the Earth's crust

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 -
Answer: Oil is gathered through mining operations

[Q]: What is the missing first step of the following process: - They are born and are a baby - The baby grows into a child - Puberty turns the child into an adolescent - The adolescent becomes an adult - An adult becomes an elderly person - The elderly person dies.
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[A]: There is a fetus in the womb

Problem: Given the question: What is the missing first step of the following process: - The heated water evaporates - The salt is left behind - The evaporated water condenses on a cold surface - The evaporated water is collected - The process is repeated - More salt is removed from the water.
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The answer is:
Water is heated