Answer:
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
I have 24 keys but cannot open any locks. Sometimes loud sometimes soft
I am natureβs way of applauding lightning.
What can travel around the world while staying in a corner?
What is yours but only used by others?