Final answer:
Lake Nicaragua is unusual because it has 400 islands. It is a large freshwater lake, and the correct answer to the question is option (c).
Step-by-step explanation:
An unusual characteristic of Lake Nicaragua is that it has 400 islands. Unlike the common perception that a lake in Nicaragua might be relatively small or saltwater due to proximity to oceans, Lake Nicaragua defies these notions with its expansive freshwater body dotted with hundreds of islands. It is not a small lake, and it is not a saltwater lake, making both options (a) and (b) incorrect. The correct answer to what is an unusual characteristic of Lake Nicaragua is (c) It has 400 islands.
An unusual characteristic of Lake Nicaragua is its possession of 400 islands, challenging common perceptions about lakes in Nicaragua. Unlike expectations of a small or saltwater lake due to its proximity to oceans, Lake Nicaragua defies these notions. It is not only a substantial freshwater lake but also boasts an expansive archipelago with around 400 islands. This unique feature makes options (a) and (b) incorrect, as the lake is neither small nor saltwater. The correct and distinctive attribute of Lake Nicaragua is its multitude of islands, making option (c) accurate. This geographical anomaly contributes to the lake's diverse ecosystem and cultural significance, offering a rich tapestry of landscapes and habitats within the freshwater expanse of Lake Nicaragua.