Hey, I have the identical tree lying flat in my yard too! It came down a week ago during the storms that went through our area. I have a gentleman who will cut it up and remove it coming this week. He burns wood to heat his home and water in an outside wood burner. I am going to assume it is a white oak tree because they do not have a large root system and the roots are shallow. A red oak will have a deeper and larger root system. The underground water table here is closer to the surface than most other areas and the trees do not require a deep root to reach water which will make them a little top heavy after they get larger and taller. It only takes the right wind gust at the right time to get the top heavy part to over power the shallow root sysem and once the top leans far enough, gravity takes over. Thank your Creator for having it fall away from your home.
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.