From the many books I have read I would say the author would use forshadowing or a very short description of the character when introduced.
Under is the correct word
Because you can’t shelter “ON” a tree nor can you shelter “IN” a tree
Hope this helps ♥︎☀︎☁︎
Compass needles follow the Earth’s magnetic field and what would be considered the planet’s magnetic North Pole doesn’t match the the planet’s geological North Pole. As the Earth’s magnetic field changes, it’s magnetic North Pole shifts with it.