Additive
Explanation:
Additive chemical combination is a type of combination of two chemicals that produces an effect that is equal to their individual effects taken together.
In this chemical combination, two chemical procedures combines to give an overall reaction that is equal another.
If the combination reinforces one another, then it is often referred to as a synergy.
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Chemical change brainly.com/question/9388643
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If you're looking for "what rocks are formed by changes..." it's Igneous Rocks.