Earths Interior Chapter 5 Section 1 Earths Interior

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 Drilling Natural Forces

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

Temperature • Top 20 m 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 ocean floor – Between 5 and 40 km thick (mountains 70 km) – 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 – 3000 km thick – Very hot solid rock – Divided up by physical characteristics • Lithosphere – upper part of mantle (1000 km) • 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