Creak! Pop! What is that in the dark?
Houses creak and pop. Wood floors and pipes do it.
Wood gets a tiny bit big when it is warm.
It gets a tiny bit small when it is cool.
In winter, wood floors can creak more.
Dry air makes the boards shrink a little.
A draft is air that slips in by a door.
People see faces in clouds. Brains are good at faces.
A hill on Mars looked like a face. Shadows did it.
Sharper photos came. It is just a hill. Now you know!
Words to know
- creak: squeaky sound
- draft: moving air
- shadows: dark shapes
- winter: cold season
