You are given a question. You need to detect which category better describes the question. A question belongs to the description category if it asks about description and abstract concepts. Entity questions are about entities such as animals, colors, sports, etc. Abbreviation questions ask about abbreviations and expressions abbreviated. Questions regarding human beings, description of a person, and a group or organization of persons are categorized as Human. Quantity questions are asking about numeric values and Location questions ask about locations, cities, and countries. Answer with "Description", "Entity", "Abbreviation", "Person", "Quantity", and "Location".

Let me give you an example: What's the most common name in nursery rhymes ?
The answer to this example can be: Person
Here is why: This question is about people's names. So, the output should be "Person".

OK. solve this:
How did water appear on the earth ?
Answer:
Description