Please select the word from the list that best fits the definition material moves in one large mass

slump
mudflow
landslide
creep

I didn't find an answer for this one so imma put it on here
slump

I believe that resources on earth that are limited. studies of shown that helium has been very low. Yes we might have a lot of somethings but come time we might run out of those resources. And yes when that happens we might be able to make synthetic materials so we could possibly overcome any shortages. So I guess that answer just remains up to time and the future generations.