1) The word "pizza" contains two vowels: I and A.

2) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active. It stands over 13,000 feet (4,000 meters) above sea level.

3) The Northern Lights, also known as the Aurora Borealis, are natural light displays that occur in the polar regions due to interactions between the Earth's magnetic field and solar particles.

4) The book series "The Chronicles of Narnia" by C.S. Lewis has sold over 100 million copies worldwide.