Instructions: 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: Animals and plants die in soft soil or mud. Sediment builds up over the remains. The remains decompose, leaving only trace amounts. The remaining parts over the years are replaced with mineral. A fossil is formed. 
Output:
Describe the process of fossilization