I'm skinny and long with a wooden coat, I write down words and math you note. I leave dark marks that you can erase, what am I, helping in every case?

Come on third I will there to great thee, Of course after gold and silver shine above me.

I have four legs but cannot walk, and a flat back but no spine. I gather families for dinner, but I never eat nor bite.

What's the difference between a hippo and a Zippo? One is really heavy, and the other is...

I flip the world for you to see, Light on sand, to a degree. I only ever show the past As nothing's ever made to last.