1) The Great Barrier Reef in Australia is the largest coral reef system in the world and is visible from space.

2) Norse mythology, originating from the Scandinavian region, features gods and mythical creatures like Odin, Thor, Loki, and Valkyries. It explores themes of heroism, destiny, and the battle between gods and giants, with intricate tales recorded in texts such as the Prose Edda and Poetic Edda.

3) The English alphabet has five vowels: A, E, I, O, and U.

4) The word "island" contains two vowels: I and A.