system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why India is the only place commonly called a subcontinent?

You hear the term “the Indian Subcontinent” all the time. Why don’t you hear the phrase used to describe other similarly sized and geographically distinct places that one might consider a subcontinent such as Arabia, Alaska, Central America, Scandinavia/Karelia/Murmansk, Eastern Canada, the Horn of Africa, Eastern Siberia, etc.
gpt
India is it's own land mass and sits on it's own tectonic plate. That plate smashed into another continental plate. So while it is part of the continent of Asia, it would also be it's own continent if it had not smashed into another one. So they call it a sub continent.

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Edit: Its. 

Also, why do all other versions of possessives require an apostrophe?  If you get your message across it doesn't matter anyway IMHO.