Earths Internal structure When a meteorite impacts a planet or moon, its energy of motion(called kinetic energy) is transformed into heat energy. As earth grew larger and larger from continual impacts its temperature increased a Radioactive decay of materials like uranium thorium and potassium also added heat
Earth’s Internal Structure ◼ When a meteorite impacts a planet or moon, its energy of motion (called kinetic energy) is transformed into heat energy. ◼ As Earth grew larger and larger from continual impacts, its temperature increased. ◼ Radioactive decay of materials like uranium, thorium and potassium also added heat
Earth's Internal structure Because Earth became partly fluid, less dense molten materials(silicon, aluminum, sodium, and potassium) were freed to migrate toward the surface a Denser melted materials. such as molten iron, sank toward the center of the planet
◼ Because Earth became partly fluid, lessdense molten materials (silicon, aluminum, sodium, and potassium) were freed to migrate toward the surface. ◼ Denser melted materials, such as molten iron, sank toward the center of the planet. Earth’s Internal Structure
TThe earth’ s Interior Planet Earth has three main parts: At the center is the densest part the core (metallic iron, nickel). Surrounding the core is the mantle Surrounding the mantle lies the thinnest and outermost layer the crust
The Earth’s Interior ◼ Planet Earth has three main parts: ◼ At the center is the densest part, the core (metallic iron, nickel). ◼ Surrounding the core is the mantle. ◼ Surrounding the mantle lies the thinnest and outermost layer, the crust
Ocean Crust Oceanic crust Moho Asthenosphere Mantle 150 Liquid Lithosphere Continental outer core crust Solid Vertical scale is 10x Inner the horizontal scale 0 km Continental crust thickness Temperature and pressure Mesosphere: hot but stronger Increase due to high pressure with depth 350km 100km Asthenosphere hot, weak, plastic rfac osphere cool, rigid, brittle Inside earth
Inside Earth
TThe earth’ s Crust a The crust is not uniform a The oceanic crust on average is about 8 km thick The continental crust on average is a bout 45 km thick
The Earth’s Crust ◼ The crust is not uniform. ◼ The oceanic crust on average is about 8 km thick. ◼ The continental crust on average is about 45 km thick