Well, yuri in manga basically means stories centered around female-female romantic connections. It can show different aspects of these relationships, like emotional struggles, sweet moments, and sometimes even physical expressions of love.
I'm not sure. To determine if it's yuri, you'd need to look at the depth and nature of the relationships between the characters. Sometimes it's not straightforward and could be open to debate.
Yes, Yuri on Ice is based on a manga. The anime closely follows the manga's framework, but there could be some minor changes or additions to suit the animation format and add more depth to the story.