More dense materials sank first as the Earth began to form during planetary differentiation. , The moon came from the Earth. , Secondary waves cannot travel through liquids. , Seismic waves show us where the liquid outer core begins. The Swaves stop while the Pwaves slow down when they enter the outer core. , The outer core is liquid. The inner core is solid. , Gravity pulls objects toward the Earth's core. , The least dense rock materials make up Earth's crust. These are mostly silicates. , Radioactive decay of elements keep the core hot. , When an ocean plate meets a continental plate, it will subduct under the continental plate because it is denser. , When 2 continental plates meet, neither will subduct but will form folded mountains. , The Ring of Fire is a volcanic arc and show were the plates are subducting. , Hawaii is on a hot spot because it is a volcanic island chain that is NOT near a plate boundary. , San Fransico is sitting on a transform plate boundary. , Convergent plates are forced together by compression. , Divergent plates are separated by magma that rise up between the plates. , A mid-ocean ridge is found at a divergent plate boundary. , Rocks closer to the mid-ocean ridge are younger. ,

Earth`s interior

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