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. 

[EX Q]: A nuclear reactor generates heat by nuclear fission. The heat created raises steam. The steam runs through turbines. The turbines generate electricity. The electricity leaves the station. 
[EX A]: How does a nuclear-powered power station generate electricity?

[EX Q]: A butterfly starts as an egg. The egg hatches. A larva emerges. The larva eats and grows. The larva sheds its skin. The larva enters a chrysalis. The pupa grows inside the chrysalis. The adult butterfly exits the chrysalis. The adult butterfly is now fully grown. The adult butterfly lays more eggs. 
[EX A]: Describe the lifecycle of a butterfly

[EX Q]: Salt water is contained in a factory or plant. The water is boiled to a very high tempature. The salt becomes seperated from the water. The salt is removed. The water is able to be drank at this point. 
[EX A]:
Describe the process of desalination