GEOL 1001 : Exam1
Document Summary
Samples can be recovered and dated by giving age of reversals in polarity: drilling and age of oceanic crust, magnetic time scale. Convecting mantle rises beneath ridges, sinks at trenches: theory 1: whole mantle convection, theory 2: stratified convection. Innermost orbital (shell) can hold a max of 2 electrons. Other orbitals can hold a max of 8 electrons. Earth"s crust: silicon-oxygen tetrahedron, fundamental building block, 4 oxygen ions surrounding a much smaller silicon ion, bonding in silicates, silicon bonds to 4 oxygens to form the si-o (silicon oxygen) tetrahedron. Joining silicate minerals: single tetrahedran are linked together to form various structures including: Isolated tetra (olivine & garnet: ring structures, single and double chain structures, sheet or layered structures, 3d networks. From by solidification of magma or molten (liquid) rock. Magma forms within the earth through melting. Temps high enough to promote melting to produce magma occur in the mantle.
