Which lines from the poem show the sea is cruel but has a facade of beauty and warmth

A savage beguiler in sheathings of silk i think

the second sentence is a great revision in my opinion. that would be a great topic.

explanation:

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.