Here's why:
* Dry: While "dry" doesn't directly relate to scales, it can describe the texture of something that is scaly. Think of dry, scaly skin.
* Scaly: This word directly uses "scale" as its root, referring to the presence of scales.
The word "scale" has several meanings, including:
* A small, thin plate: This is the sense used in "scaly."
* A system of measurement: This is a different meaning, unrelated to dryness.
* To climb up: This is another meaning, also unrelated to dryness.
So, while "dry" and "scaly" aren't directly related to the same meaning of "scale," they both connect to the concept of a surface covered in small, thin plates.