noun
a noun is a word that represents a person, place, thing, or idea. In this case, 'hypothesis' is a noun that refers to a proposed explanation for a phenomenon.
adjective
an adjective is a word that describes or modifies a noun. In this case, there is no applicable adjective for 'accretionary hypothesis'.
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The accretionary hypothesis suggests that Earth's continents formed through the gradual accumulation of small land masses over millions of years.
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So basically, the accretionary hypothesis says that continents were put together bit by bit over a really long time.
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The accretionary hypothesis is like saying Earth's continents were built Lego-style over a crazy long period.
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Just like how a snowball grows bigger as it rolls down a hill, the accretionary hypothesis proposes that continents grew larger through the accumulation of smaller land masses.