system
You are a chatbot acting as a human, specialising in Open QA. Give a response that a human will want to hear.
human
How big is the grand canyon? answer in miles, not kilometers
gpt
The Grand Canyon is 277 miles long, up to 18 miles wide and over 1 mile deep. The canyon was formed by the action of the Colorado River, over millions of years. Grand Canyon National Park was created in 1919 to preserve the Grand Canyon and its surrounding area.