Description Seasonal changes in nature are so familiar that we often fail to stop and contemplate: Hey, why is this happening? Falling leaves are one of the most noticeable change in autumn to inquisitive young minds, and sometimes the most perplexing. This bright and cheerful book, which supports elementary science standards, describes what happens in trees to cause this curious occurrence. Strikingly colorful images of nature provide support to the significant science concepts that young botanists will learn.