Answer:
The Titanic is still here.
My days are numbered.
I am gentle enough to soothe your skin light enough to fly in the sky and strong enough to crack rocks.
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down but should not be forgotten.
What has many teeth but can't bite?
Dry though I may be, I am still a sea.