1) No Quiz Today 2) Pick up Revised Syllabus if you did...
Transcript of 1) No Quiz Today 2) Pick up Revised Syllabus if you did...
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Today:1) No Quiz Today 2) Pick up Revised Syllabus if you did not get one last week3) Get Clickers out 4) Weathering Lecture5) Begin: Sedimentary Rock Lecture
Monday, October 28, 13
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Just from looking at the shape of this Volcano, which is the best description?
A) low viscosity, high volatiles, high explosivity
B) high viscosity, high volatiles, low explosivity
C) high viscosity, low volatiles, high explosivity
D) high viscosity, high volatile, high explosivity
E) none of the above
Monday, October 28, 13
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Just from looking at the shape of this Volcano, which is the best description?
A) low viscosity, high volatiles, high explosivity
B) high viscosity, high volatiles, low explosivity
C) high viscosity, low volatiles, high explosivity
D) high viscosity, high volatile, high explosivity
E) none of the above
Monday, October 28, 13
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What type of volcano is this?
A) Volcanic dome
B) Continental caldera
C) Scoria cone
D) Shield volcano
E) Stratovolcano
Monday, October 28, 13
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What type of volcano is this?
A) Volcanic dome
B) Continental caldera
C) Scoria cone
D) Shield volcano
E) Stratovolcano
Monday, October 28, 13
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This volcano is probably located at______.
A) convergent continental collision zone
B) continental rift
C) divergent boundary
D) convergent subduction zone
E) none of the above
Monday, October 28, 13
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This volcano is probably located at______.
A) convergent continental collision zone
B) continental rift
C) divergent boundary
D) convergent subduction zone
E) none of the above
Monday, October 28, 13
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The high viscosity of the lava that composes this volcano is probably the result of____________.
A) the location of where the melt was generated
B) partial melting of the asthenosphere
C) decompression of the asthenosphere
D) the high mafic content of the magma.
E) fractional crystallization
Monday, October 28, 13
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The high viscosity of the lava that composes this volcano is probably the result of____________.
A) the location of where the melt was generated
B) partial melting of the asthenosphere
C) decompression of the asthenosphere
D) the high mafic content of the magma.
E) fractional crystallization
Monday, October 28, 13
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Weathering, Erosion, and Deposition=
Sedimentary Rocks
A Story of Rock Recycling
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Monday, October 28, 13
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WeatheringThe process that breaks up and corrodes solid rock, in place, eventually transforming it into sediment.
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Mechanical Weathering reduction of rock/grain size by physically breaking (disintegration) without changing the composition.
Chemical weathering conversion of unstable mineral and bulk rock composition (dissolving) into stable compounds at the Earth’s surface.
Monday, October 28, 13
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WeatheringThe process that breaks up and corrodes solid rock, in place, eventually transforming it into sediment.
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Mechanical Weathering reduction of rock/grain size by physically breaking (disintegration) without changing the composition.
Chemical weathering conversion of unstable mineral and bulk rock composition (dissolving) into stable compounds at the Earth’s surface.
Monday, October 28, 13
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Physical/Mechanical Weathering
Text
Frost Wedging Root Wedging Salt Wedging Thermal expansion/contraction Exfoliation
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Physical/Mechanical Weathering
Text
Frost Wedging Root Wedging Salt Wedging Thermal expansion/contraction Exfoliation
Frost and root wedging takes advantage of exfoliation
cracks
Monday, October 28, 13
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Physical/Mechanical Weathering
Text
Frost Wedging Root Wedging Salt Wedging Thermal expansion/contraction Exfoliation
Monday, October 28, 13
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Chemical WeatheringDissolutionHydrolysisOxidation
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Dissolution
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Chemical Weathering
H2O + CO2 <--> H2CO3 (carbonic acid)
Monday, October 28, 13
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H2CO3 + CaCO3 <--> Ca+2 + 2HCO3-
Dissolution
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Chemical Weathering
H2O + CO2 <--> H2CO3 (carbonic acid)
(Calcite/Limestone) (Bicarbonate)
Monday, October 28, 13
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Hydrolysis
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Chemical Weathering
2KAlSi3O8 + 2H+ + 9H2O --> Al2Si2O5 (OH)5 + 4H4SiO4 + 2K+2Potassium Feldspar
Kaolinite clay Silicate acid
Monday, October 28, 13
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Hydrolysis
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Chemical Weathering
2KAlSi3O8 + 2H+ + 9H2O Potassium Feldspar
Monday, October 28, 13
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Hydrolysis
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Chemical Weathering
2KAlSi3O8 + 2H+ + 9H2O Potassium Feldspar
Kaolinite clay Silicic acid --> Al2Si2O5 (OH)5 + 4H4SiO4 + 2K+2
Monday, October 28, 13
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Oxidation
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Chemical Weathering
Olivine
(Mg, Fe)2SiO4 + 2H2OOlivine
Monday, October 28, 13
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Oxidation
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Chemical Weathering
Olivine
2FeO + H2SiO4 (Mg, Fe)2SiO4 + 2H2O -->Olivine Silicic acid Ferrous iron
Monday, October 28, 13
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Oxidation
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Chemical Weathering
Olivine
2FeO + H2SiO4
Hematite (rust) Fe2O3
(Mg, Fe)2SiO4 + 2H2O -->Olivine Silicic acid
-->Ferrous iron -->
2FeO + 2H2O
Hematite-->
Monday, October 28, 13
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Where do the Ions go?
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H2CO3 + CaCO3 <--> Ca+2 + 2HCO3- (Calcite/Limestone) (Bicarbonate)
Monday, October 28, 13
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Where do the Ions go?
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H2CO3 + CaCO3 <--> Ca+2 + 2HCO3- (Calcite/Limestone) (Bicarbonate)
Monday, October 28, 13
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Where do the Ions go?
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H2CO3 + CaCO3 <--> Ca+2 + 2HCO3- (Calcite/Limestone) (Bicarbonate)
Monday, October 28, 13
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Where do the Ions go?
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Chemical Sedimentary Rocks
Limestone (CaCO3)Chert (SiO2)
Cements
Calcite (CaCO3)Silica (SiO2)Hematite (Fe2O3)
Monday, October 28, 13
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Subsurface Weathering
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Weathering of Common Rocks
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Subsurface WeatheringChemical Weathering
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Subsurface WeatheringChemical Weathering
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Subsurface WeatheringChemical Weathering
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Enjoying Weathering
Spelunking Carlsbad Caverns.
Cool crack climbs, Joshua Tree NP25
DissolutionMechanical Weathering
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ErosionRefers to the combination of processes that separates weathered bedrock (sediment)is transported to a new location.
Coastal erosion Wind Erosion
Surface Run off
River Erosion
Glacial Erosion
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Enjoying Erosion Canyoneering, Zion NP
Hanging around Grand Canyon
Yampa River, Utah27
Monday, October 28, 13