Problem: Given the question: What is the missing first step of the following process: - 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 - The temperature rises even faster.
++++++++++++++++++++++++++++++++
The answer is:
Greenhouse gases are released into the air by human activities

Problem: Given the question: What is the missing first step of the following process: - You must draw up a plan to what kind of orbit the satellite will travel - You make preparations for the rocket that will travel into space - Prepare the crew that will send it there - You begin the countdown date for the rocket - And then you send the rocket carrying the satellite into space - Once in orbit the satellite will be placed where it was planned.
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The answer is:
You must decide the purpose of the satellite

Problem: Given the question: What is the missing first step of the following process: - The pollution negatively affects the water quality - The pollution negatively affects the health of plants and animals - The plants and animals have shorter, less healthy lives - The plants and animals do not reproduce very well - The number of plants and animals decreases over time - The quality of water gets worse and worse as there are no plants or animals to clean it - Eventually there is nothing living in the water and it is unusable -
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The answer is:
Pollution enters natural water sources such as rivers and lakes