TASK DEFINITION: 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. 
PROBLEM: Water in the clouds becomes very cold. The cold water forms ice crystals. The ice crystals grow by absorbing surrounding water droplets. Form snowflakes. The snowflakes fall to the ground. 

SOLUTION: How does snow form?

PROBLEM: Food is put into mouth. Food is chewed and mixed with saliva (spit). Food travels down the esophagus (throat). Food travels into the stomach. Acid in the stomach breaks the food down further. Food travels into the small intestine. Nutrients from food are absorbed into the blood stream. Food travels into the large intestine. Most of the remaining material is now waste. The waste is eventually removed from the body. 

SOLUTION: Describe the process of digestion

PROBLEM: 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. 

SOLUTION:
How does a nuclear-powered power station generate electricity?