1) The word "pencil" contains two vowels: E and I.

2) 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.

3) The word "orange" contains three vowels: O, A, and E.

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