What is a Mountain Author:Chris Arvetis and Carole Palmer "What a big hill!" says Christopher. "That's no hill," says Big Bear. "It's a mountain." Big Bear tells Christopher all about mountains as the two friends climb and climb together. — The JUST ASK series explains the world to your child. In simple words and colorful pictures, these Weekly Reader books answer the questions your youngster loves t... more »o ask.« less