Located in NE Ohio

Good day,

I have this tree that has started to crack down the middle. I am able to make the crack move with some weight. I don't have enough karma to post on the arborists subreddit. I am trying to identify it so that I can research what I could possibly do or if it needs to be removed.

Thank you!

I was told Poplar but I’m not sure.

Hi all, hoping someone can help identify these lovely trees at Pymble, NSW, Australia.

Grows in my seasonal pond. Has willow like branches