Meaning: This sentence describes the sound made when someone walks on snow with boots.
Choice of Words: Crunched means made a crushing sound, under means beneath or below, and boots are a type of footwear.
Meaning: This means the same as the first sentence, but it uses a different word to describe the sound of the snow.
Choice of Words: Crackled is a synonym of crunched. It means to make a sharp, snapping sound.
Meaning: This means the same as the first two sentences, but it uses a different word to describe the sound of the snow.
Choice of Words: Squeaked is another synonym of crunched. It means to make a high-pitched, squeaky sound.