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Inside the Earth Composition (What it is made of) • Crust • Mantle • Core The Crust • Outer layer • 5-100 km thick • 2 types of crust – Oceanic (very dense, made of basalt) – Continental (less dense, made of granite) Oceanic and Continental Crust The Mantle • Middle layer • Very thick layer The Core • Made mostly of iron • 1/3 of the earth’s mass • Very hot 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- solid rock that flows slowly (like hot asphalt) • Mesosphere- middle layer • Outer Core- liquid layer • Inner Core- solid, very dense Tectonic Plates • Earth’s crust is broken into about 19 pieces • These plates move on top of the asthenosphere