Although academic writing varies widely, several features are often associated with U.S. academic English in general:
conventional grammar, spelling, punctuation, and mechanics
organization that links ideas explicitly
an easy-
explicitly stated claims supported by evidence
careful documentation of all sources
consistent use of an appropriate level of formality
conventional use of idioms
use of conventional academic formats, such as literature reviews, research essays, lab reports, and research proposals
This brief list suggests features of the genre often described as U.S. academic writing. Yet these characteristics can lead to even more questions: What does conventional mean? How can you determine what is appropriate in any given rhetorical situation? New contexts often require the use of different sets of conventions, strategies, and resources, so ask your instructor for advice, or check with your writing center, local library, or friends for examples of the kind of text you need to create.