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notes 11 18 - Chapter 1 The Earth-crust mantle core most of...

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Chapter 1 The Earth -crust, mantle, core most of the earth is igneous molten material Crust - The continental crust Granite – coarse, more siliet Andesite – near volcanos in the Andes Mountains -Thicker crust, float (floats higher, is less dense and thicker) on mantle w/ oceanic crust. Continental crust below part of the oceanic crust (mostly above water line) The ocean crust Gabbro Basalt - both coarse - a few islands not continental – Hawaii, Iceland Mantle Gabbro Basalt - convection to make new ocean crust, moving continents around, and forming new mountains Core Iron Nickle -not a silicate rock, mostly alloids and metals, flows (like malasses) but very little mixing b/t it and mantle – gives magnetic field Old Supernova – forming earth 4.5 billion years ago, reminants came together to make a new star, and a new group a planets surrounding it Cloud spins, faster and faster, the sentriphical force causes it to flattenen to be flat, mat'l thrown out, gravity brings it together very closely with lost of heat. Helium is formed,
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