Chlorine, Oxygen, Bromine and Argon are obviously a gas. The substance that is most likely dense is Silver. Hope this helps.
Cays form on coral reefs as a result of wave action.
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Pollution, climate change, and more have stripped from these communities the right to their most basic needs: clean water, food, air, and safe housing. Here's a look at how these issues spurred the environmental justice movement—and how much work still needs to be done.
Island Africa is the largest