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: "when did the southern ocean become a thing?" whose answer is the 1770s.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the southern ocean become a thing
Useful Output:

Doc 1: Yet the U.S. Board on Geographic Names has used the Southern Ocean name since 1999, and the National Oceanic and Atmospheric Administration
Doc 2: Starting on June 8, World Oceans Day, it will recognize the Southern Ocean as the world's fifth ocean.
Doc 3: Hourglass dolphins live in the southern circumpolar waters, from close to the Antarctic ice pack.
Doc 4: In June, the National Geographic Society named the Southern Ocean as the newest of Earth's five oceans. Dive into why the Southern Ocean was
Doc 5: The National Geographic Society has just added a new ocean to the list! It's the Southern Ocean and it's located around Antarctica.