a wooded perimeter is a mean of thing & if neutrons of a land plant or vegetable are lost in a thing then that thing used to be covered by land in the surprise & hanging of copper are lost in a wooded perimeter ->  the wooded area used to be covered by water in the past  the wooded area used to be covered by water in the past & if something used to be in the surprise then that something has changed -> the place has changed from being covered by water to a wooded area