input question: What is the missing first step of the following process: - Engines produce carbon dioxide - Living things produce waste - Waste decomposes - Decomposition produces methane - Water evaporates - Water vapor joins the atmosphere - Carbon dioxide, water vapor and methane are greenhouse gases -???
output answer: People breathe and expel carbon dioxide

input question: What is the missing first step of the following process: - Water is poured into the well of the machine - A filter is placed in the basket - Ground coffee is measured into the filter - Turning on the machine starts the water heating - The hot water rises up - The water drops into the ground coffee - The hot water passes through the grounds - The coffee drips into the pot from the basket.???
output answer: The coffee pot is filled with water

input question: What is the missing first step of the following process: - May come from different sources - The gases remain trapped in the atmosphere - Through the suns light the gases hold in heat and energy - Trap them in our atmosphere - The earth may become warmer this way.???
output answer: Several types of gases form in the atmosphere

input question: What is the missing first step of the following process: - The cracks get very long and big in some places - The earth places pressure against the rocks on both sides of the cracks - The pressure causes the rocks to press against each other very hard - The cracks continue to develop - The earth moves against itself on both sides of the cracks - The pressure and movement around the cracks causes the rocks to crumble in some places - A lot of energy is released - The energy causes seismic waves - The seismic waves move the earth in an earthquake.???
output answer:
The earth develops cracks deep beneath the surface