Noun

a group of closely scattered islands in a large body of water.

bellwether
Noun

an indicator of trends

Noun

irregular, recurring weather system that features a warm, eastern-flowing ocean current in the eastern Pacific Ocean.

Noun

archipelago in the Pacific Ocean, off the coast of Ecuador.

Noun

group of similar organisms that can reproduce with each other.

undercurrent
Noun

a current below the upper currents or surface