Earth Sciences 2281A/B Midterm: Midterm Memorization

• School: Western University
• Department: Earth Sciences
• Course: Earth Sciences 2281A/B
• Professor: Robert Schincariol

Document Summary

The currently accepted age of the earth is 4. 6 billion years old. Oceanic ridges are associated with divergent plate boundaries. The most abundant minerals in the earth"s crust and mantle are silicates. Dolomite, the major mineral in dolostones, has a chemical composition of camg(co3)2. Pegmatite; crystallized from water-rich (therefore ions), highly differentiated, residual magma. And in that chart, we said that the minerals that form at lower temperature are the weakest most susceptible to weathering and the minerals that form at higher temperature are the strongest and therefore the least susceptible to weathering. The pattern follows the order of the series. A joint is a roughly parallel fracture in a rock showing no displacement (i. e, it happened naturally. The rock hasn"t moved at all but like, it broke). "the present is key to the past" = uniformitarianism. A transform fault is a strike-slip fault that forms the boundary b/w tectonic plates. Normal and reverse faults have mainly dip slip movement.