Answer:
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
What has to be broken before you can use it?
I am a mini solar powered computer.
Lives in winter, dies in summer, and grows with its roots upward. What is it?
I build up castles. I tear down mountains. I make some men blind, but I help others to see. What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.