Answer:
Rock fossils are created when three events occur: dead organisms are buried in sediment; hard tissues mineralize; the material that surrounds the remains hardens to form rock.
To help you remember:
"dead organisms are buried in-" remember that in the word "sediment" you can spell the word "d-i-e-s" with the first four letters of the word.
See: sediment
For "hard tissues mineralize", imagine you had to blow your nose in a tissue. Well, now the tissue is hard: "hard tissues". And if someone askes, "Who's is this?"
Just remember: The hard tissues are mineralized.
Lastly, "surrounding remains hardens to form rock" because when you play rock music, everyone in your surroundings will stop and stand still to listen almost like they're hardening.
Is this an absolutely ridiculous way to remember how rock fossils are created? Yes. But will you think about this silly way to remember it from now on? Yep!
It's just so weird that you end up remembering it.