Earth’s Structure. The layers of Earth. Earth is divided into 3 layers based on chemical composition. Core: Dense metallic center, made up of mainly metal iron. Mantle: Liquid middle layer made up of silicon, oxygen and magnesium.
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Inner coreThe Physical Structure of Earth
cool rigid layer, made up of the crust and upper layer of the mantle.
Lithosphere is divided into pieces called tectonic plates.
4. Outer core: Layer of liquid Iron and Nickel.
5. Inner core: Solid iron and nickel, temperature is estimated to be between 4000ºC to 5000ºCPhysical Structure cont.
Earthquakes produce seismic waves, and travel thru materials at different speeds.
Scientists use these waves to determine the density of each of Earth\'s layersMapping Earth’s Interior
Split into two continents – Laurasia and Gondwana (thousands of years ago).
Split into today\'s continents.
Continents sometimes collided, forming mountain ranges and volcanoes.The Breakup of Pangaea