Plank
Thin, lightweight wood is balsa.
No I think the answer is parel
SLAT
Board
board
Board
paper
Young ice is newly formed thin ice flat on a sea or lake. It begins with the letter Y.
a 4 letter word for a thin frog is a toad
nail
obese
A thin piece of wood?
A pane of glass is a thin, flat piece of glass.
maybe I think it's "slice"
Envelope
envelope
it is a envelope.
envelope
envelope
paper
an envelope :)
The ball presents less Surface Area to the air than a flat sheet. So, there is less air resistance when a thin piece of paper is crumpled into a ball.
Shale is a type of rock. A piece of shale is normally flat and thin like a small chalkboard.