If you add a pea To a six legged being, You get me, An act of Examining

Columbus travelled the seas with me, Harry's parents filled his vault with me. Lose one letter and you can measure fluids with me.

Brown and dead, A body with no head. Found in water and not buried underground, Floating away and not sinking down.

An amber elixir Great by the lake Gets me so excited I start to shake

Threshed wheat, unpainted plank. Old film, saltwater tank. With me is smooth, Against me a rebel. Pressure and time form a sediment pebble.