 The Earth. What's actually happening inside? Let's start at the surface. We see a composition of plates that are in motion relative to each other. Here the plates have a dark blue color and plate boundaries are light blue. Then we go down in depth by about 150 kilometers. That's 13 times deeper than the deepest point in any ocean. Where we see that the plates are subducting inside the Earth. A cross-section shows how, in this case the Pacific plate, is subducting at the Mariana trench. Now, to reveal the movement in Earth's interior, we take rock particles just before the trench, the white dots. We follow these particles on their long journey from Earth's surface to the deep interior, eventually rising back up after thousands of kilometers and then again descending. This cyclic flow of rock is called mental convection. An impressive look into the Earth, like shown here, is the result of a computational simulation of mental convection in the whole globe. Getting to this point was difficult in many different ways. We are to overcome huge challenges in several research areas. That's geophysical modeling, mathematics, computational algorithms, parallel software development and fast supercomputers. These are great tools and it's what it takes to crack the extremely complex physics of the Earth.