Most coal beds seem to have developed in swamps where a tree, after it becomes _______________________ waterlogged, sinks to the bottom.
(Most coal beds; seem; ) (Most coal beds; to have developed; L:in swamps) (it; becomes waterlogged; _______________________) (it; waterlogged; ) (where a tree; sinks; to the bottom; T:after it becomes _______________________ waterlogged)
Most coal beds Most coal beds it it where a tree
seem to have developed becomes waterlogged waterlogged sinks
L:in swamps
_______________________
to the bottom T:after it becomes _______________________ waterlogged