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: Coal is burned at a furnace. The resulting heat energy is used to heat water. The heated water is turned into steam. The steam drives a generator. Electricity is produced. 

Answer: How does a coal-powered power station generate electricity?


Question: Magma rises through cracks in the Earth's crust. The pressure causes plates to move. Magma explodes to the surface. The lava from the eruption cools to form new crust. After several eruptions, the rock builds up and a volcano forms. 

Answer: What causs a volcano to erupt?


Question: Someone is infected with bacteria. That bacteria begins to grow and reproduce inside the cells. The dividing bacteria begin to make toxins. Those toxins damage your cells. Disease symptoms may begin. 

Answer:
Describe how bacteria can cause disease.