I think this is a great shot that did not meet the challenge. I see that this is your first entry and I have a feeling you will do well once you get the hang of this site. I try only to enter the competitions I have an appropriate photo for. I am not a great photographer but I think that your photo would have done better in another challenge. Good luck.
While it meets the challenge objective - the photo lacks interest. Perhaps more detail of the bubbling -- possibly a different angle , may have improved that.
I wish I knew the year that this was assigned to. I'm sure you'll hear that from other voters. So, maybe take that as constructive feedback. I really like the depth of your set up. I would like to know how you did that. The part I don't like as much is that it feels like it is a close up shot rather than a vast pool of lava.