The planetary crust is the outermost layer of a planet, where we find landforms, oceans, and other features. It is made up of solid rock and minerals, forming the surface that we walk on. On Earth, the crust is relatively thin compared to the layers beneath it, like the mantle and core. Different planets have different types of crusts, influenced by their unique geological processes. For example, the crust of Mars is much thicker than Earth's and has features like volcanoes and canyons. In contrast, the crust of Venus is mostly volcanic and has a very different composition. Understanding planetary crusts helps scientists learn about the history and evolution of each planet in our solar system.