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Small earthquakes that often precede major earthquake |
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Smaller earthquakes that follow main earthquake |
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Along faults where differential stresses have ruptured Earth's crust |
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Earth's plates are continually moving and interacting with neighboring plates |
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2 plates move together, oceanic lithosphere descends beneath an overriding plate to be reabsorbed into the mantle |
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2 plates move apart, upwelling of hot material from mantle creating new seafloor |
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2 plates grind past each other without production or destruction of lithosphere |
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Active seismic area in subduction zone, differential motion produces deep-seated earthquake |
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Occurs in interior of tectonic plate, very rare but much damage |
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Earthquake Causes Damage By |
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Factors of Nature from Earthquakes |
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Liquefaction, Landslides, Fire, Floods, Avalanches, Tsunamis |
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Mercalli Scale, Subjective destruction/observations in populated areas, Not accurate for comparison |
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Richter Scale, Records seismic waves, Assigns number 1-10 for comparison, Can be used in any part of the world |
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Unstable slope causing dirt/mud/rocks to move down incline |
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Unstable slope causing snow to move down incline |
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Are animals good predictors for earthquakes? |
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No. There is studies that suggest they can sense p-waves before s-waves, but those only occur seconds apart from each other. |
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Preventing Damage & Injury During Earthquake |
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Safe Building Practices, Reinforced Steel Structures, Building on bedrock instead of soft rock, Evacuations |
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Landforms Vertical Structures Horizontal Structures Vegetation Water Climate |
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Physical, natural or manmade structures situated on Earth's surface |
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Increase in earth elevation by crustal thickening causing mountainous formations |
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Extending earth causing crustal thinning resulting in valley formations |
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Nicknamed "Top of the World" at 29,029 feet |
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All changes in original shape, size/volume or orientation of rock body |
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Factors Affecting Deformation |
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Temperature, Confining Pressure, Rock Type, Time |
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Compressional Tensional Shear |
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Anticline, Syncline, Monocline |
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Upfolds or aches with oldest sedimentary layers in the center |
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Downfolds or troughs with youngest sedimentary layers in the center |
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Steplike folds or dips in horizontal sedimentary |
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Rocks tend to break/fracture; Near the surface In cool temperatures Strong molecular bonds Sudden stress increased |
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Some bonds break while others form, allows rock to change shape; Deep in crust High Temperatures Weak Molecular bonds Gradual Stress |
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Uplift and erosion removes overlying load reducing compressive load |
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3 Competing Mechanisms that Contribute to Joint Formation during Uplift and Erosion |
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Tensional Stresses Chemical Weathering Groundwater Movement |
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Weak tensile strength of rock, often form same time as faults |
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Rocks cool and develop shrinkage fractures, look like elongated columns |
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3 Geometric Features of Fold |
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Symmetrical (Mirrored) Asymmetrical (Not Mirrored) Overturned (Tilted) |
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Upwarped, circular or elongated sedimentary structure |
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Downwarped, circular or elongated sedimentary structure |
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2 Principal Ways Folds Form |
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Shortening or thickening of crust |
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Ductile formation causes the bending of rock forms |
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System that contains numerous geologically related mountains |
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How to tell which mountain belts are older or younger? |
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Taller mountains are younger than lower mountains because they have undergone more weathering and erosion |
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Processes that collectively result in formation of mountains |
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Concept that Earth's crust is floating in gravitational balance upon material of mantle |
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Part of continental crust that has attained stability, not affected by tectonic activity during Phanerozoic Eon, Consists of shield and stable platform |
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Remains or traces of prehistoric life in sediments, Time indicators |
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Rapid burial Possession of hard parts Soft parts of subject to decay, bacteria |
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Petrified Molds/Casts Carbonized Impressions Preserved in Amber or Tar Mummified Preserved bones/teeth/shells Chemical Fossils |
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Features of Trace Fossils |
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Indirect evidence of prehistoric life such as tracks, burrows, coprolites (feces & stomach content), gastroliths (stomach stones) |
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Life Form Becoming a Fossil |
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Living plant or animal dies, soft parts exposed to air decompose quickly, hard parts decompose slowly (greatest fossil chance) |
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Most by accident, but some researched paleontologists |
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Process by minerals precipitate porous material (wood/bone) from groundwater solutions, Water seeps into pores |
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Only seen with microscope |
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Bivalves Brachipads Bryozoans Cephalopods Corals Crinoids Gastropods Graptolites Trilobites |
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Once soil forms, forces (wind & water) carry soil components in thin sheets to streams where they are deemed sediment, then transported until deposited on sea bed |
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Energy Processes that Drive Landscape Evolution |
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Weathering, Mass wasting and Erosion |
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What happens when rate of uplift exceeds rate of erosion? |
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What happens when rate of subsidence exceeds rate of uplift? |
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Connects equal points of elevation |
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Difference of elevation between each contour line |
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6 Factors in Land Development |
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Parent Material Time Climate Plants Animals Topography |
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Downslope movement of rock, regolith and soil under direct influence of gravity |
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Slump Rockslide Debris Flow Earth flow Creep Solifluction |
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Weathering precursor weakens rocks and breaks them apart |
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3 Factors Influencing Strength of Slope |
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Saturation Vegetation Removal Earthquake Vibrations |
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