Answer:
I can be swallowed But I can also swallow you.
I am a sharp looking horse with a flaxen tail. The longer I run the shorter my tail becomes.
I am a mini solar powered computer
I can be written, I can be spoken, I can be exposed, I can be broken. What am I?
I come without being fetched at night hides away as soon as daylight strikes. Although I may look small I am much mightier than what you can imagine.
I build up castles. I tear down mountains. I make some men blind. I help others to see.