The crust is the layer of the Earth upon which we live. It is made up of ____________________. The crust is about 70 km thick on land (the ____________________ crust) and about 5 km thick under the ocean floor (the ____________________ crust). The ____________________ is the layer underneath the crust. It is made up of both solid and ____________________ rock. The mantle is much _____________________ than the crust. It is around 3000 km deep. The ____________________ is the layer underneath the mantle. The outer core is made up of liquid ____________________ and nickel. It is around 2000 km thick. The ____________________ is at the centre of the planet. It is also made up of iron and _____________________. However; due to the intense pressure surrounding it, the metals exist in a ____________________ state. Although it seems like the crust is stable ground beneath our feet; in actual fact, it is constantly ____________________. The reason we cannot feel this movement is that it is extremely slow; only a few ____________________ each year. The part that is moving is made up of the Earth’s crust and the upper mantle. Together, this layer is called the ____________________. The lithosphere floats on a layer of melted rock called the ____________________. The lithosphere is made up of ____________________ major plates and numerous minor plates. The seven major plates are the African, Antarctic, Eurasian, North American, South American, India-Australian and the Pacific plates. ____________________ plates can slide past each other (transform boundaries), slide away from each other (divergent ____________________) or slide ____________________ each other (convergent boundaries). These movements can contribute to events such as earthquakes, ____________________ eruptions and tsunamis.​