There is one sentence like: We know little about the constant reconfiguration of the coastline. Does this statement mean that coastline changes periodically or it doesn't change periodically?
I guess that reconfiguring something means changing something to different form. And the context of the paragraph from where this statement has been taken suggest to me that reconfiguration happens quite periodically.
Please refer Q-18 of reading section of the IELTS practice test Vol.2 https://ieltsonlinetests.com/4429534/result/ielts-recent-actual-test-answers-vol-2-reading-practice-test-2