Which landform represents the boundary between the land and an ocan or lake a) coastline b) delta c) dune d) glacier

First of all, a coast is where land ends and the sea/lake starts.

Therefore, the coastline, is the "border", or as you said it, the boundary between the continent and a sea or in some cases a lake.

Hope it helped,

BioTeacher101

chemical because it warmed up which involves temperature and it bubbled which includes changing

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i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.