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. 

Input: Consider Input: Snow falls in an area for a very long time. The snow builds up for a very long time. The snow starts to become packed very firmly. The snow becomes something that's more like ice. Air pockets in the mass continue to grow smaller. The mass becomes solid and heavy enough to be called a glacier. The glacier moves because of gravity. 

Output: How do glaciers form and move?


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

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


Input: Consider Input: Blood enters the kidney. The blood travels into the neophrons. Waste is expelled via the neophrons. The waste goes to the bladder in the form of urine. The clean blood exits the kidneys. 


Output: How do kidneys filter blood?