Which phase of the writing process involves checking the content to see if the essay is sufficiently detailed and adequately support the thesis statement ?

Revising or the revision phase.

Explanation:

Writing is a recursive process and thus, involves certain stages to be followed for an organized and effective literary piece. These stages involve the prewriting, drafting, revising and the last one would be editing. The revising phase allows the author to take a look back on to the structure and details of the content included in the paper which would assist in finding out the loopholes and organize the information more effectively. This stage helps the author to revisit his idea in order to modify, alter, and amend the desired or intended thought or idea behind the work and present to the audience a better version of the work.

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a is the indefinite article