Without citizenship, how to get jobs entries in US as 'Geologist / Hydrogeologist' ???

Note: I have good work experience in other countries.

Being labor certified in the US is very difficult. It takes many many years and costs thousands and thousands and thousands of dollars.

Hydrogeology was a hot field a few years ago, but it went through a massive downturn and everyone got fired. I do not know what the current situation.

If your field is hot, with huge labor shortages, or you have very special skills, you can sometimes find someone to get you in on a temporary work visa, like an H-1 visa perhaps or some other kind. They are easier and cheaper to get. If you want to stay permanently in the US, it is far far harder.

you can start by applying for a work visa. check www.immigrationhelp.com for information