Should I use adjective or adverb?

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GuilhermeRM

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The study research reveals startling proofs of constant changing seafloor that [...]
The study research reveals startling proofs of constantly changing seafloor that [...]

I thought ''changing'' was a noun, but my answer paper says it is participle, which demand an adverb modifier. Could anyone explain why? Thank you.:up:
 

SoothingDave

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If you are describing an action, then use an adverb. How is it changing? It is changing constantly.
 

GuilhermeRM

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May I use constant if ''changing'' is an adjective?
 

5jj

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