Okay, so there are some things that can determine characteristics of coastlines. Take for example, estuaries, which are in essence nurseries for fish, where fresh water mixes with the salt water; in these, the coasts are more than likely primary.
Primary coasts are shaped from things relevant to land, like tectonic plates. Secondary coastlines are result of things relevant to marine, like waves.
In all honesty really, I originally took random guesses as to which ones were which.
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