Indubitably, the processes of reading and writing are interdependent. For, after all, when people read, it is the writing of another that they examine--the "other side of the coin," so to speak. And, of course, writers revise their work before submitting their work for publication. Therefore, the results of writing, revising and reading are learning in the sense of both apprehension and comprehension.
Further, since the purpose of all language activity is communication, both writer and reader exercise cognitive skills in their efforts to communicate ideas. When, for instance, poets compose verses, they are discriminate in their choice of words and use of poetic and literary devices as they desire to convey not only their themes, but also impressions and connotations and extended meanings. And, as readers examine these poems and other texts as well, they certainly develop their communication skills, thereby increasing apprehension.
Certainly, good writers compose their literary efforts with a sense of the reader in mind, knowing that revision is the most important part of the writing process. In this revision, writers build knowledge about the forms and functions of language which the reader, in turn, also learns. In affirmation of the interdependent constructive processes of writing and reading, one authority writes,
In reading, meaning is built from texts and in composing, meaning is built for text.
Inextricably connected, writing and revising, and reading all are directed toward effective communication which provides learning.