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Vocabulary Chapter 1: Lesson 2 Seismic waves Pressure Crust Basalt Granite Mantle Lithosphere Asthenosphere Outer core Inner core Seismic wave oWhat an earthquake produces pressure o o A mass of rock pressing on an area EX. The deeper down the greater the pressure Crust The layer of rock that forms Earth’s outer skin; both dry land and ocean floor Basalt o A dark fine grained rock that makes up the ocean floor • Granite A rock that is usually a light in color and has coarse grains which is the most amount of rock that makes up the continental crust Mantle • A layer of hot rock that is divided into layers and nearly 3000 km. thick lithosphere • The crust and the uppermost part of the mantle that is brittle rock. • asthenosphere The soft hot layer under the mantle that is under more pressure that is less rigid than the lithosphere but still solid Outer core • Layer of molten metal surrounding the inner core which is liquid Inner core • A dense ball of solid metal (iron and nickel)