Discover the many layers of Earth’s sky, oceans, cities, mountains, and valleys in this high-interest series. Explore cities from the top of a skyscraper down to street level and then underground to see the gritty, hidden systems that keep a city functioning. Zoom through space from the atmospheric layers surrounding earth to galaxies far, far away. Investigate Earth’s layers from mountaintops to molten core. Travel through the ocean from tidal pools into the deep abyss. Filled with geological and biological fun facts and detailed illustrations, this series is perfect for readers who thrive on discovery.