Answer:
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
What gets sharper the more you use it?
A caribbean shape that makes ships disappear.
I am a precious stone, as clear as a diamond. Though you can walk on water with my power, try to keep me, and I'll vanish in an hour. What am I?
What invention lets you look right through a wall?
My first is snapping, snarling, growling, My second's industrious, romping, and prowling. Higgledy piggledy Here we lie, picked and plucked, and put in a pie.