Answer:usually a wall or a bridge seperates another country
Explanation: hope i helped
Answer:
Just talk trash about them
Explanation:
Talk about them with someone you trust so that they won't tell anyone
I assume you meant which method is least reliable for identification.
If so, the answer would be COLOR, since there are many minerals that are different, yet share similar color. So it wouldn't be reliable to identify a mineral based off it's color.
