This book explores the wonders that can be found at Yellowstone National Park, and explains how they occur. Learn how and why this park came into existence and about the wildlife that is allowed to roam free. Completely redesigned for today's young investigative reader, True Books are an indispensable addition to any collection. Each book guides readers through the facts that nurture their need to know. True Books have been upgraded and updated. Information is presented in a thorough yet engaging manner, featuring lively sidebars, a glossary, visual back matter, and an index. Common Core Alignment L.4.6. Acquire and use accurately grade-appropriate general academic and domain-specific words and phrases, including those that signal precise actions, emotions, or states of being (e.g., quizzed, whined, stammered) and that are basic to a particular topic (e.g., wildlife, conservation, and endangered when discussing animal preservation).