1. ) <span>Vanikoro >> site of two shipwrecks
2.) </span><span>" a fine death for a sailor " >> " a coral tomb "
</span>3.) Gilboa >> <span>island where Aronnax and friends are allowed to go ashore
</span>4.) <span>Straits of Torres >> entrance to the Indian Ocean
</span><span>5.) La Perouse >> commander of the La Boussole
6.) " an incident " >> </span>the Nautilus<span> runs aground</span>
Don’t click that it’s a s.cam
The common synonyms are usually unknown, uncertain, unclear, etc.
That would be a fragment. Its not a complete sentence
The chemicals had caused the eruption of smoke that filled the air. (Not sure if this is 100%)