Planet Earth is the third planet from the Sun, characterized by its diverse ecosystems, life-supporting atmosphere, abundant water, and dynamic geological processes. Articles are a unique way for readers to learn about the world around them. In addition to building reading comprehension skills and increasing vocabulary, articles can be used for writing and research. Each Planet is broken into 6 single-page sections: Introduction, What is it Made of?, By the Numbers, Neighbors, Amazing Facts, and Words to Know.