Answer:
It goes up and down the stairs without moving.
Mountains will crumble and temples will fall, and no man can survive its endless call. What is it?
What falls down but is never injured?
There are 7 birds in a tree. A hunter shoots one bird down. How many birds are left in the tree?
This type of corn swells up and bursts into a crisp puff when heated.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?