Discover why dirt is an important resource in this photo-filled nonfiction book for budding young scientists. What's so great about dirt? A lot, actually! In this Pebble Explore book, discover how this often overlooked - or even annoying - part of nature is essential to our world. We need dirt to grow crops and construct buildings and roads. Dirt is even important to the air we breathe! With eye-popping photographs, quick facts, and beyond-the-book back matter, Why Do We Need Dirt? will have young researchers and science fans exploring more about the NATURE WE NEED"--