EESA06H3 Lecture Notes - Lecture 4: Red Sea, Continental Shelf, Graben
Document Summary
Lec 04: january 25, 2016 - how oceans form. Life cycle of ocean basins: embryonic, mature, dying. Rift basin (crack in continental plate which will widen and turn into an ocean) and flood basalt. Igneous dikes takes the magma deep underground, to the surface. Triple junction and failed rifts" (aulacogens) rift that never develops into an ocean, filled with sediment, they are still moving, just enough to create earthquakes (ex. Homo habilis (handy man) 2 million years ago. Erte ale shield volcano in afar triangle of ethiopia. Convection hot rock rising, cold rock ascending. Terrains blocks, collided with north america, and became smooth. 3 types of rocks: igneous rocks, metamorphic and sedimentary. When rocks cool, they are attacked by gravity, etc. and break into sand. Either at the earth"s surface (extrusive) or underground (intrusive or plutonic") they are pushed up. Silicate structure and its effects on magma viscosity. Polymerization when molecules combine to form more complex structures.
