Earth is much more than earth: it is rocks, vapors, stardust. And far from being a still and calm planet, it stretches, moves through the universe at more than one hundred thousand kilometers per hour, breaks and reassembles itself. There are those who say that we know more about space than our home, but in these pages we will demonstrate the opposite: this book is an adventure that invites you to discover our planet from the surface to its very core, passing through all its layers as if we were traveling by elevator to the center of the Earth. After reading it, it will never be the same to make a castle in the sand or a gutter around the tent. Luckily we are not alone in the journey, since scientists have always invented the most incredible theories to try to understand what the soil is like under our feet, what is its age and its transformations. And thanks to new technologies, and above all to the latest challenges of the scientific imagination, today we can make a fantastic journey that has little to envy to Jules Verne's novels. At every step we will be threatened by earthquakes, tsunamis and volcanic eruptions. However, thanks to the expert guide of Diego Ruiz, the adventure of knowing the Earth (and the geologists) will be the most pleasant and even fun. It still moves ... but here we go! Down.