Answer:
When heat from inside Earth is transferred to its surface "More dense material is pushed to the crust".
Step-by-step explanation:
The Earth is made of four different layers- crust, mantle, liquid outer core and solid inner core. Out of these, the inner core has the highest temperature. As heat moves from area of high temperature towards area of lower temperature, the heat from inner core transfers towards the outermost surface of the Earth i.e. crust which happens through conduction and convection. As the heat moves from the core towards crust, the materials around the inner core starts losing heat and hence become less dense and as the heat reaches the surface warm and more dense materials gets pushed to the crust in form of magma.