Term
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Definition
| The breakdown of rock by physical and chemical reactions with air and water. |
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Term
| How do smooth rocks get cracks? |
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Definition
-Naturally occuring from the expanding and contracting from the cooling process
-Earthquakes
-Lava - as it cools, it contracts, causing cracks |
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Term
| These affect the type and rate of weathering. |
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Definition
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Term
| Rock breaks down faster in this type of climate. |
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Definition
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Term
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Definition
| Fractures. Results from tectonic stresses of contracting to to cooling igneous rock. |
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Term
| Three types of tectonic stress |
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Definition
Compressive
Tensional
Shear |
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Term
| How is columnar basalt formed? |
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Definition
| When the lava cools, in contracts towards a center point, creating a 5 or 6 sided column. |
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Term
| What is physical weathering? |
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Definition
| The mechanical fragmentation of rocks from stress. |
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Term
| What are some types of physical weathering? |
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Definition
-Frost wedging
-Thermal weathering
-Wetting drying (hydration)
-Unloading (exfoliation)
-Salt wedging
-Biological weathering |
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Term
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Definition
| when water gets into a crack, and the freezes, expanding the crack |
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Term
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Definition
| The weather changes from hot to cold |
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Term
| Wetting drying (hydration) |
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Definition
| Absorption of moisture causes swelling. |
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Term
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Definition
| Expanding after heavy loads are removed, or the expanding removes some rock. |
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Term
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Definition
| Water settles into the cracks, evaopartes, but leaves the salt behind. Salt crystals grow and shatter the fence post. |
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Term
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Definition
Plant roots can expand cracks.
Burrowing animals carrying air and water down into bedrock. |
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Term
| What is chemical weathering? |
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Definition
| Chemical reactions with minerals that break down rock. |
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Term
| Three types of chemical weathering |
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Definition
-Hydrolysis
-Oxidation
-Dissolution |
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Term
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Definition
| A chemical reaction between water and another substance to produce a new compound that is usually weaker than the original |
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Term
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Definition
| When oxygen dissolved in water comes into contact with certain rock minerals. |
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Term
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Definition
| The process by which a solid, liquid or gas forms a solution in a solvent |
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Term
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Definition
| Chemical weathering where limestone bedrock dissolves when it comes in contact with groundwater. |
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Term
| What landforms produced from the karst process? |
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Definition
-Sinkholes
-speleothem (the caves)
-haystack hills
-tufa cones |
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Term
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Definition
| A cave created thru the karst process. Contains stalactites and stalagmites. |
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Term
| How are haystack hills formed. |
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Definition
| Over time, sink holes from the karsting process merge together. the ground left behind are known as haystack hills. |
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Term
| Name some hydrothermal features. |
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Definition
Geysers
Hot springs
Fumaroles
Tufa cones |
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Term
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Definition
| Where groundwater comes in contact with heated igneous rock below the surface. As the water heats, the pressure builds until it blows. |
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Term
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Definition
| Where ground water comes in contact with heated igneous rock, but it is not under pressure. |
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Term
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Definition
| Like a geyser, but instead of water, it is just steam. |
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Term
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Definition
| The result of overflow of warm groundwater. Midway at the Homestead. |
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Term
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Definition
| The down slope movement of earth material due to gravity. |
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Term
| How does water affect mass wasting? |
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Definition
| Water lubricates, makes everything slippery and adds weight. It saturates the soils. |
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Term
| Most important factors in slope failure |
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Definition
Saturation of slope material with water
Earthquakes
Freezing and thawing |
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Term
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Definition
Rockfall
Slump
Earth or mudflow
Solifluction
Creep |
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Term
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Definition
| Cracks in rocks indicate water erosion. Rockfall can be one rock, or lots. Accumulated rocks and the bottom of a cliff is called Talus. |
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Term
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Definition
| It creates step-like terraces as it slumps down. |
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Term
| Describe earth or mud flow. |
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Definition
| Lots of water, like a muddy river. Very moist environment |
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Term
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Definition
| Occurs in extremely cold environment, high altitude, in permafrost. The top few inches or feet thaws and starts to slide over the frozen layer. Creates irregular terrain. |
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Term
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Definition
| The supercontinent that was made up of all landmasses on the earth |
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Term
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Definition
| The north portion of the supercontinent Pangaea. |
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Term
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Definition
| The southern portion of the supercontinent Pangaea. |
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Term
| Describe Continental Drift. |
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Definition
| Alfred Wegner's theory that the continents were drifting across the ocean bed. He recognized the puzzle-like shape of the continents and the plant, wildlife and rock that matched on continents separated by ocean. Unfortunately, he did nt know the mechanism behind the theory and so it was dismissed. |
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Term
| Describe Plate Tectonics. |
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Definition
| The lithosphere is made up of large plates that shift and move as a result of convection. Plates were dicovered through seafloor mapping and mapping of earthquake patterns. |
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Term
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Definition
| Discovered thru Paleomagnetism and Ocean Rock Floor Sampling |
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Term
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Definition
| A spot deep in the mantle which leaks hot magma/lava to the the earth's surface. Hot spots do not move. The Hawaiian islands were created by hot spots. Yellowstone has one. |
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Term
| What is an accreted terrane? |
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Definition
| The addition of material to a plate during the subduction process. Accounts for geologic incongruities between continental interiors. NV, OR, WA all accreted onto the North American Plate. |
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Term
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Definition
| Deformation of the earth's crust, particularly thru folding and faulting |
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Term
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Definition
| It is the result of compressional forces. Downfold is a syncline, upfold is anticline, monocline does not fold. |
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Term
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Definition
| Where the layers of bedrock erode quickly because of folding and looks like a syncline, but is not. |
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Term
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Definition
| Rock that has been forcefully broken. Occurs along zones of weakness in the earth's crust. Common in Coastal areas |
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Term
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Definition
Broad domes. Wider than it is tall.
Magma is extremly hot and very runny. Gas bubbles rise to the top and are released into the atmosphere. Found over hot spots. Hawaii. |
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Term
| Composite or strato volcano |
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Definition
| Magma is cooler, thick, pasty and viscous. Bubbles cannot rise so the pressure builds until there is a large explosion. Cone shaped. Mt Pinatubo |
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Term
| Name some extrusive volcanic landforms. |
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Definition
| Shield or composite volcanoes, and caldera. |
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Term
| Name some intrusive volcanis landforms. |
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Definition
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Term
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Definition
| Magma that cools and solidifies below earths surface. Igneous Intrusive. Usually Granite. |
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Term
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Definition
| Magma that gathered in one spot between two sheets of sediment. Pushes the upper layer upward. |
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Term
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Definition
| A vertical layer of magma that melted its way up. |
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Term
| Wegner's evidences for continental drift. |
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Definition
-Puzzle-like fit of widely separated continents
-Similarity of rock and mountain formations near coastlines of separated continents
-Matching fossils of extinct species on widely separated landmasses |
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Term
| Three types of plate boundaries. |
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Definition
Divergent
Convergent
Transform |
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Term
| Describe a divergent plate boundary. |
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Definition
Where the boundaries are being pushed apart. This happens at ocean ridges, were the convection process pushes magma up and pushes the boundaries apart.
Mid-Atlantic Ridge |
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Term
| Describe a convergent plate boundary. |
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Definition
Where plates come together. Oceanic plates collide, denser one gets drawn down. Friction causes magma to move up. Unsubducted plate will have island chain. Aleutian Islands.
Oceanic-Continental - Oceanic is more dense, so it will subduct and create a volcanically active mountain range. Cascade Mtn Range.
Continental-Continental - They don't subduct, so they move up, creating mountains. Himalayan Mountains. |
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Term
| Describe a transform plate boundary. |
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Definition
| The plate are sliding past eachother. San Andreas Fault. |
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Term
| Example of landforms assciated with faulting. |
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Definition
Block Mountain Range - the Wasatch Range.
Horsts and Graben - Great Rift Valley in Africa |
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Term
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Definition
| The volume rate of water flow. Amazon has greatest discharge. |
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Term
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Definition
A small stream that jons another. Small streams have no tributary.
First stream orders are without tributaris. When two first-order dtreams combine, they are called a 2nd order stream.Eighty percent of streams are 1st, 2nd, or 3rd order. |
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Term
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Definition
| The trough water travels in. |
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Term
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Definition
| All streams transport sediment. Stream-transported sediments are eventually deposited in a river or ocean. |
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Term
| Types of fluvial transportation |
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Definition
Dissolved load - salt/minerals
Suspended load - clay and silt
Bedload - sand and larger |
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Term
| Characteristics of bedload |
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Definition
Carries partciles the size of sand or larger.
Saltation is the bouncing of sand as it goes down the stream
Traction is the process of pushing larger rocks down the stream
If a stream doubles in speed it can carry rocks 64x heavier. |
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Term
| Name four channel patterns. |
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Definition
Straight
Meandering
Sinuous
Braided |
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Term
| Describe how a delta is formed. |
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Definition
| As streams dump into the cean, they deposit sediment in theo the sea until the sediment builds up and blocks the stream, rerouting the water. Mississippi River. |
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Term
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Definition
| Flat or nearly flat plain adjacent a river. Extends to edges of valley, created by meandering. Floods when river is full. |
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Term
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Definition
| A natural or artificial earthen ridge that runs parallel to a river to prevent overflow. |
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Term
| Effect of stream gradient. |
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Definition
| Higher gradient (steeper) river flow faster, can carry more stuff. |
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Term
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Definition
| A small tributary that runs paralle to a larger stream. Will Usually join the larger one. When levees form, it has a harder time eroding through. |
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Term
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Definition
| A stream that branches off from the main channel. Usually occurs near an cean or lake. |
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Term
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Definition
| A cutoff meander. The water ct through the rock, leaving a u-shaped river. |
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Term
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Definition
| Sediment deposited by a stream. |
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Term
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Definition
| A ravine between cliffs carved by water. |
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Term
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Definition
A cliff near a river which has not been eroded yet.
Erosional landform |
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Term
| Where will you find a sand bar or point bar? How is it created? |
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Definition
| On the inside of a meandering stream.The water inside the curve is mving slower, so it deposits some of its sedimentry content. |
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Term
| The difference between perennial and ephemeral streams. |
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Definition
| Ephemeral streams are occaisional, they don't flow all year. Perennial streams run al year. |
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Term
| Erosional and depositional dynamics of river meanders. |
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Definition
| As meanders curve, they erode the outer edges and deposit on the inner edges. |
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Term
| What are paired terraces? |
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Definition
| Terrace at opposite sides of a river that match in height. Reflects where the river bed was before it cut down into the earth. Erosional. |
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Term
| What is an entrenched meander? |
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Definition
| The same as incised. It cuts down into the earth. |
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Term
| Describe a knickpoint retreat. |
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Definition
| The river bed is resistant to erosion, be the earth underneath that layer is not. At water falls, the water erodes the less resistant layer, causing the bed layer to fall because it has no support. Niagara Fals used to retreat 3 feet per year. Now it is closer three inches every decade. They rerouted the water for energy. |
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Term
| Subduction zone island chains |
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Definition
| Oceanic subducting: Aleutian Islands |
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