1. Earth’s Interior

2. Geology The study of planet Earth. Study of… –The forces that make and shape planet Earth. –The chemical and physical characteristics of rock. –The processes that create Earth’s features and search for clues about Earth’s history.

3. 3 Layers of the Earth’s Interior Crust Mantle Core

4. Crust Layer of rock that forms Earth’s outer skin. 2 Types of Crust –Oceanic crust Crust beneath the ocean. Made of basalt –Dark, dense rock with a fine texture –Continental crust Crust that forms continents Made of granite –Rock that has larger crystals than basalt, not as dense

5. Mantle Layer of hot rock below the crust. Temperature and pressure in the mantle increase with depth. Lithosphere –Consists of the crust and the uppermost part of mantle. Asthenosphere –Layer below the lithosphere that is soft –Mantle below is solid

6. Core Inner layer made of metals iron and nickel. 2 Layers –Outer core Layer of molten metal that surrounds the inner core. –Inner core Dense ball of solid metal

7. Earth’s Magnetic Field Currents in the liquid outer core force the solid inner core to spin at a slightly faster rate than the spinning of the whole Earth. Earth’s magnetic field –Caused by the core movement –Causes the planet to act like a giant bar magnet

8. Earth’s Interior Earth is divided into Core Crust Mantle is divided into Outer core Inner core

9. Summary Questions What are the layers that make up Earth? Write a sentence about each one. What happens in Earth’s interior to produce Earth’s magnetic field? Describe the layers of the interior where the magnetic field is produced. What are some of the differences and similarities between the mantle and the core? Explain.