GEOS 212: Exam 1
54 Cards in this Set
| Front | Back |
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Most volcanoes along spreading centers are:
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shield volcanoes
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Likelihood of an eruption at Mount Rainier during your lifetime?
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will not happen
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Main hazard from
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pyroclastic flows
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When did Pangea exist
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200 mya
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What type of sediment present in stream?
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boulders and gravel
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Main types of sediment in floodplain
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sand & mud
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Location of Turbidites on map
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East side of South America
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Iron in your body comes from
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Mica
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Diatoms make their skeleton out of
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quartz
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The profile for scavenged elements is
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high at the surface, low at depth
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Rain makes sea water
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fresher
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Andes mountains created by
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subduction zones
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Sea level is NOT affected by
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amount of sea ice
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Average water depth
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4 km
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Water depth above spreading center
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2 km
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Water depth on the continental shelf
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100 m
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Age of oldest ocean floor
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180 my
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Age of newest ocean floor
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0, new ocean floor is always being created
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Hawaii is on a
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hot spot
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Rock found in most mountains on continents
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Granite
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Which tectonic plate is Tucson on?
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North American
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Which tectonic plate is Los Angeles on?
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Pacific
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Average depth of a trench
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10 km
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Skeletons are found where
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shelf or deep ocean floor
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Magma turns into basalt
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spreading center or ocean-ocean subduction zone
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Magma turns into andesite
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ocean-continent subduction zone
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Continental crust vs Ocean crust
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continental crust: 30-35, granite, low density
Ocean crust: 7-10, Basalt, high density
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Photosynthesis-Plants
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CO2 + H20 --> Organic Matter + O2
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Respiration/Remineralization
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Organic matter + O2 --> CO2 + H20
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Pangea formed
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Atlantic and Himalaya mountains
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Turbidite aka...
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submarine landslide
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Headwaters
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Boulders and gravel
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Flood plain
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Sand and mud
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Delta
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sand, mud, skeletons
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Slope
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turbidities
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deep sea floor
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mud, clay, and skeletons
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T/F. Chlorine comes from volcanoes
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True
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T/F. Magnesium is removed by basalt
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True
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T/F. Calcium in seawater comes from feldspar
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True
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Where hotspots are found
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Hawaii, Yellowstone
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Where transform vaults are found
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near Los Angeles
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where Colliding continents are found
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Himalaya, Alps, Appalachians
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Where a chain of subduction zone volcanoes are found
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Andes, Cascades
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Where continental rifting is found
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Africa, Western U.S.
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Driving force for plate tectonics
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Heat drives convection cells and plate motions. Plates move because the asthenosphere below is mushy.
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Destroys/makes crust: Ocean/continent
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Destroys/makes crust: Ocean/continent
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Destroys/makes crust: Ocean/Ocean
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destroys old oceanic crust, makes new oceanic crust
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Shield volcano
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Hot spots and spreading centers, continuous eruptions, not explosive, not hazardous
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Strato volcano
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Subduction zones and continental rifting, (seattle and mt rainier), eruptions are rare, explosive, hazardous, ash pyroclastic flows
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Salinity variations are driven by what
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precipitation, evaporation, runoff, and ice freezing/melting
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Levels of salinity in the ocean depend on what?
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the sun
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Find feldspar where?
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head waters
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find quartz where?
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Headwaters, flood plain, slope, ocean floor
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find calcite where?
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ocean floor
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GEOS 212: Exam 1