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 was the last time crater lake volcano erupted?" whose answer is about 4,800 years ago.
Each document should contain about 30 words, and these documents should contain useful information.

Query: last known eruption Crater Lake volcano
Useful Output:

Doc 1: The catastrophic eruption of Mount Mazama that occurred approximately 7,700 years ago destroyed the volcano while simultaneously forming the
Doc 2: In a tremendously powerful eruption more than 6,000 years ago, cracks opened beneath the volcano and drained away several cubic kilometers of molten material.
Doc 3: The eruption is said to have been 40 to 50 times as powerful as that of Mount St. Helens in 1980. If you've seen film or TV footage from that
Doc 4: There is data available for 5 confirmed Holocene eruptive periods. 2850 BCE (?) Confirmed Eruption (Explosive / Effusive)
Doc 5: Crater Lake lies in a basin, or caldera, formed by collapse of the Cascade volcano known as Mount Mazama during a violent, climactic eruption about 7,700 years