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

2) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active.

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

4) The novel "To Kill a Mockingbird" by Harper Lee has been translated into more than 40 languages and has sold over 40 million copies worldwide.