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Transcript
Inside the Earth The Geosphere Composition (What it is made of) • Crust • Mantle • Core – Inner – Outer The Crust • Outer layer • 1% of Earth’s mass • 5-100 km thick (2 – 25 miles) – Equal to a piece of paper on a basketball • 871 C (1600˚ F) • 2 types of crust – Oceanic (very dense, made of basalt) – Continental (less dense, made of granite) Oceanic and Continental Crust The Mantle • Middle layer • 2880 km thick layer (1800 mi) • Up to 4426 C (8000 ˚ F) The Core • Made mostly of iron and nickel – Outer core • 2240 km thick (1400 mi) • 6093 C (11,000 ˚ F) • Movement is source of Earth’s magnetic field – Inner core • solid • 1280 km thick (800 mi) • 7204 C (13,000 ˚ F) • 1/3 of the earth’s mass Earth’s Layers • How are the earth’s layers similar to an egg? • Shell=crust • Egg white=mantle • Yolk=core Physical Structure of the Earth (5 Layers) • Lithosphere- rigid outer layer (crust) • Asthenosphere- upper layer of mantle, solid rock that flows slowly (like hot asphalt) • Mesosphere- lower layer of mantle • Outer Core- liquid layer • Inner Core- solid, very dense Tectonic Plates • Earth’s crust is broken into about 19 pieces called tectonic plates • These plates move on top of the asthenosphere