Compositional Layers divided into 3 layers based on elements that make up each layer

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Presentation transcript:

Compositional Layers divided into 3 layers based on elements that make up each layer

CRUST Continental Crust Oceanic Crust Outermost, solid layer Made mostly of oxygen, silicon, and aluminum Divided into two types: Continental Crust Less dense Thicker (30-100 km) Under continents Oceanic Crust Denser (2x more iron, calcium, and magnesium) Thinner (5-20 km) Under ocean

MANTLE Convection occurs in this layer! Layer between crust and core 2,900 km thick Contains about 2/3 of Earth’s mass (67%) Mostly made up of magnesium Solid but acts like a liquid (like asphalt or chewed gum)

CORE Densest layer Made of iron and nickel Extends from mantle to center of Earth Radius of 3,430 km (diameter = 6,860 km) About 1/3 of Earth’s mass (33%)

Physical Layers divided into 5 layers based upon different physical properties

LITHOSPHERE ASTHENOSPHERE MESOSPHERE Solid, rigid outermost layer Crust and upper mantle 15-300 km thick Divided into pieces called tectonic plates ASTHENOSPHERE Middle mantle Solid but acts like a liquid (plastic-like) Convection – allows movement of tectonic plates 250 km thick MESOSPHERE Lower mantle, beneath asthenosphere Solid, liquid-like rock flows slower 2,550 km thick

OUTER CORE INNER CORE Between mesosphere and inner core Only liquid layer! Made up of iron and nickel Convection – creates Earth’s magnetic field 2,200 km thick INNER CORE Innermost, densest layer Pressure causes it to be solid Made up of mostly iron and some nickel Radius = 1,230 km (diameter = 2,460 km)