In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage. 
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Question: Warm, moist air moves from south to north. Cool, dry air moves from north to south. The air masses meet. The conditions that form are not stable because the air masses are so different. Winds are directed in a certain way because of how the masses interact. An updraft results. Winds start to form circular patterns in the updraft. A tornado can result. 

Answer: How do tornadoes form?


Question: A plant dies and withers. The dead plant starts to draw microbes. The microbes break down the material. Forms decay. The resulting material disappears. The plant becomes one with the soil. 

Answer: How do bacteria break down dead plants?


Question: Build a satellite. Attach a rocket. Add rocket fuel. Launch rocket. Satellite goes into orbit. 

Answer:
Describe the steps in launching a satelite into space.