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Geology Exam 3
Fossils, Earthquakes, Mountain Building, Mass Wasting
68
Geology
Undergraduate 1
11/19/2013

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