1. GEOLOGY COLLEGE TEST OUT

2. PYROXENE Chain silicate Contains Fe, Mg, Si Dark black or dark green augite

3. AMPHIBOLE Similar to pyroxene Double chain silicate No green- dark black only Hornblende

4. porphyry Two different sized crystals Two different rates of cooling phenocryst Porphyritic andestie Porphyritic diorite

5. OOLITIC LIMESTONE From precipitation of seawater White concretions of CaCO3 fizz

6. Igneous rocks Clast- made of pieces Clastic- sedimentary –Sandstone, conglomerate, shale Pyroclast(ic)- igneous »Tuff

7. Lava or pyroclast?

8. EARTH LAYERS http://crack.seismo.unr.edu/ftp/pub/ louie/class/plate/composition.html http://crack.seismo.unr.edu/ftp/pub/ louie/class/plate/composition.html

9. Earth’s layers Crust- –Continental- feldspar, quartz –Oceanic- pyroxene, plag, olivine Mantle- olivine outer core- liquid iron Inner core- iron

10. Ocean crust Denser Mafic Thinner Only 200 million years old

11. How do plates move? Convection currents Slab pull Where does heat come from? –Radioactive decay

12. Plates

13. Sea floor spreading Oldest ocean crust= 200 my Polar reversals New crust in center of ridge

14. Plate boundaries

15. Pangea

16. Why wasn’t Wegener’s cont. drift accepted? No seafloor data No earthquake data No mechanism to move plates Convection currents Slab pull Ridge push (thermal plumes)

17. isostasy is a term used in geology to refer to the state of gravitational equilibrium between the earth's lithosphere and asthenosphere such that the tectonic plates "float" at an elevation which depends on their thickness and densitygeologygravitationalearthlithosphereasthenospheretectonic plates

18. Accretionary wedge

19. Magmatic arc

20. Half life problem If you begin with 80 grams of 14 C after a time, 20 grams are left. How old is the sample? One half life= 14,000 years

21. Magnitude scale Each step is 10x

22. Passive plate margins Non- tectonic Continental shelf- slope- rise