You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "what is the name for the dark spots on the moon?" whose answer is maria (singular mare).
Each document should contain about 30 words, and these documents should contain useful information.

Query: dark spots on the moon
Useful Output:

Doc 1: The far side has far fewer 'maria', which are large dark patches caused by ancient volcanic flows. Instead it is much more densely covered
Doc 2: Modern study of the Moon has revealed these dark spots to be not water but large seas of dried lava.
Doc 3: The Moon's surface is littered with lacerations. Created by boulders that were sent rolling by an asteroid or seismic event, these grooves
Doc 4: Researchers are searching for an explanation for why the side of the Moon that faces Earth happens to be covered in dark spots,
Doc 5: You can buy Universe Sandbox 2 game here: http://amzn.to/2yJqwU6 Hello and welcome to What Da Math! In this video, we will talk about the