Earth’s Interior Chapter 5 Section 1

Earth’s Interior Geologists learned about Earth’s interior: Directly from rock samples Info from rocks that come to the surface Natural Forces Drilling

Earth’s Interior Indirectly from seismic waves (earthquakes) Waves from earthquakes will change speed and direction when traveling through different densities

Temperature Top 20m are cool Temperature raises as you go deeper Heat is left over from formation of Earth and radioactive substances Pressure increases as you go deeper

Earth’s Structure Crust – outermost layer Solid rock that includes dry land and ocean floor Between 5 and 40 km thick (mountains 70km) Oceanic crust is mostly rocks like basalt (dark, fine texture) Continental crust is mostly rocks like granite (light, coarse texture)

Earth’s Structure Mantle – thickest layer 3000km thick Very hot solid rock Divided up by physical characteristics Lithosphere – upper part of mantle (1000km) Asthenosphere – less rigid (plastic like) Lower mantle – solid material that extends to core

Earth’s Structure Core – Earth’s center Made mostly of Fe and Ni Liquid outer core and solid inner core Scientists think that movement of the liquid core creates a magnetic field

Brain pop