Creosote forms when soot builds up.

Meaning: This sentence is saying that when soot collects and gets thicker, it turns into a substance called creosote.

Choice of Words: Creosote is a thick, black substance that forms when soot accumulates, Forms means to come into existence, When is used to indicate a specific time or event, and Builds Up means to gradually increase in amount or quantity.

Alternative Expressions

Related Expressions

• Chimney sweeps remove soot and creosote.
• Creosote is highly flammable.
• Soot marks chimney walls.
• Soot blackened the chimney.
• Soot particles stick to chimney walls.
• Rainbow forms colorful arc after rain.
• Rainbow forms after rain.
• Rainbow forms in sky after rain.
• Ice forms on water.
• Art expresses beauty in many forms.