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It depends on the size and location of the hematoma.
i believe it takes 100 years to form a delta
rocks
It takes about 10 million years for it to form. This is not necessarily true for all nebulae. It is hard to tell the exact average of how long it takes. There are different factors that determine how long it takes.
rocks
It takes of years for a canyon to form.
It takes about as long as a water cycle
It takes about 13.99 billion years for a galaxy to form.
Yes
Millions of years
2 - 3 years
it takes a long time