Difference between revisions of "AY Honors/Geology/Answer Key/es"

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Image:Nile River and delta from orbit.jpg|Satellite image of the Nile '''River Delta'''
 
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Image:Baltic spits.png|The three narrow strips of land shown here are '''spits''' in the Baltic  Sea
 
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Image:DeadSeaSinkhole.jpg|'''Sinkholes''' near the Dead Sea
 
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Image:Oxbow lake.jpg|Map of an '''oxbow''' lake
 
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Image:Moraine mediane Arsine.JPG|'''Moraine''', glacier and lake of Arsine, Écrins National Parc, French Alps
 
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Image:Iceberg Cirque.jpg|Iceberg '''Cirque''', Glacier National Park, USA
 
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Image:Mesa raymine.jpg|'''Mesa''' at Ray Mine (Arizona, USA)
 
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Image:Mini Alluvial Fan Imprinted with Footprints.jpg|A small '''alluvial fan'''.
 
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[[Image:Anticline.jpg|thumb|250px|An '''anticline''' on the left, a '''syncline''' on the right.]]
 
 
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[[Image:Skjaldbreidur Herbst 2004.jpg|thumb|300px|"Skjaldbreiður", an Icelandic shield volcano whose name means "broad shield."]]
 
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A '''shield volcano''' is a large volcano with shallowly-sloping sides.  Shield volcanoes are formed by lava flows of low viscosity — lava that flows easily. Consequently, a volcanic mountain having a broad profile is built up over time by flow after flow of relatively fluid lava issuing from vents or fissures on the surface of the volcano. Many of the largest volcanoes on Earth are shield volcanoes. The largest is Mauna Loa on the Big Island of Hawaii.
 
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[[Image:Sthelens1.jpg|thumb|300px|Mount St. Helens on May 17, 1980, one day before the devastating eruption.  It is a composite volcano.]]
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A '''composite volcano''' is a tall, conical volcano composed of many layers of hardened lava, tephra, and volcanic ash. These volcanoes are characterized by a steep profile and periodic, explosive eruptions. The lava that flows from them is viscous, and cools and hardens before spreading very far. Mount St. Helens in Washington, USA, Popocatépetl in Mexico, and Krakatoa in Indonesia are composite volcanos.
 
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Ice behaves like an easily breaking solid until its thickness exceeds about 50 meters (160 ft). The pressure on ice deeper than that depth causes plastic flow. The glacial ice is made up of layers of molecules stacked on top of each other, with relatively weak bonds between the layers. When the stress of the layer above exceeds the inter-layer binding strength, it moves faster than the layer below.
 
  
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Another type of movement is basal sliding. In this process, the whole glacier moves over the terrain on which it sits, lubricated by meltwater. As the pressure increases toward the base of the glacier, the melting point of water decreases, and the ice melts. Friction between ice and rock and geothermal heat from the Earth's interior also contribute to thawing. This type of movement is dominant in temperate glaciers. The geothermal heat flux becomes more important the thicker a glacier becomes.
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Before glaciation, mountain valleys have a characteristic "V" shape, produced by downward erosion by water. However, during glaciation, these valleys widen and deepen, which creates a "U"-shaped glacial valley. Besides the deepening and widening of the valley, the glacier also smooths the valley due to erosion.
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At the 'start' of a classic valley glacier is the cirque, which has a bowl shape with escarped walls on three sides, but open on the side that descends into the valley. In the cirque, an accumulation of ice is formed. These begin as irregularities on the side of the mountain, which are later augmented in size by the coining of the ice. After the glacier melts, these corries are usually occupied by small mountain lakes called tarns.
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Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. Sedimentation is the deposition by settling of a suspended material.
 
  
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When water flows over a stream bed, it picks up sediments.  The faster the water flows, the larger particles it can transport.  As the water slows, the particles are dropped, forming a sediment.  Because the water speed slows gradually, the particles are sorted by size as they are dropped.
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====Fold Mountains====
 
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The compressional forces in continental collisions may cause the compressed region to thicken, so the upper surface is forced upwards. In order to balance the weight, much of the compressed rock is forced downwards, producing deep "mountain roots". Mountains therefore form downwards as well as upwards. However, in some continental collisions part of one continent may simply override part of the others, crumpling in the process.
 
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====Block or Faultblock Mountains====
 
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[[Image:Horst graben.jpg|thumb|Horsts and Graben]]
 
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Block mountains are created when large areas are widely broken up by faults creating large vertical displacements. This occurrence is fairly common.  The uplifted blocks are block mountains or horsts. The intervening dropped blocks are termed graben: these can be small or form extensive rift valley systems. This form of landscape can be seen in East Africa, the Vosges, the Basin and Range province of Western North America and the Rhine valley.<br style="clear:both">
 
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====Dome Mountains====
 
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[[Image:Enchanted rock 2006.jpg|thumb|Enchanted Rock, a dome mountain just west of the Hill Country of central Texas in the United States.]]
 
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In geology, a dome is a deformational feature consisting of symmetrically-dipping anticlines; their general outline on a geologic map is circular or oval. The strata in a dome are upwarped in the center; if the top of a dome is eroded off, the result will be a series of concentric strata that grow progressively older from the outside-in, with the oldest rocks exposed at the center. Many geologic domes are too large to be appreciated from the surface, and are readily apparent only in maps. Well-known regional structural domes include the Llano Uplift and the Ozark Dome.
 
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====Volcanic Mountains====
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[[Image:Volcano.jpeg|thumb|Mount St. Helens in May 1980, shortly after the eruption of May 18]]
 
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A volcano is an opening (or rupture) in the Earth's surface or crust, which allows hot, molten rock, ash and gases to escape from deep below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time.
 
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When a river reaches a low-lying plain in its final course to the sea or a lake, it meanders widely. Sediments are deposited on the inside (convex) bank because the current there slows. In contrast, both lateral erosion and undercutting occur on the outside (concave) bank where the stream’s speed is the highest.  The faster current on the outside of a bend is able to pick up sediments and transport them further downstream.
 
  
 
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First, let's define what these three types of rock are:
 
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;Sedimentary: Sedimentary rock is formed when sediments carried by wind or water settle and turn to stone.
 
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;Metamorphic: Metamorphic rock is formed when another type of rock is transformed by great heat and pressure.
 
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;Igneous: Igneous rock is formed when lava cools and solidifies.
 
  
 
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[[Image:Graded bed.png|thumb|250px|Normal graded bedding]]
 
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The size of a particle that a stream can transport depends on the stream's speed as well as the size and density of the particle.  In general, the faster the current, the larger the particle that can be transported.  As a stream slows, it drops the largest particles first.  As it slows more, it continues to drop finer and finer particles.  When the current stops, all sediments are deposited.  In the diagram note how the sediment at the top is much finer than the sediment at the bottom.  This natural sorting mechanism occurs whenever sediments are deposited, and can be used to detect boundaries between sedimentation events.  A normal graded sediment indicates that the sediment layer has not been overturned since it was deposited, while an inverted bed (finer particles at the bottom, larger ones on top) indicates that the sedimentation layer was overturned after its deposition.
 
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[[Image:Sand Norderney.jpg|thumb|300px|Ripple marks in sand]]
 
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In this photo, the wind was blowing from left to right.  The left sides of the ripples have gentler slopes, while the right sides have steeper slopes.  As the wind breaks over the top of the ripples, it forms eddy currents (circulating wind) which make the lee side steeper than the windward side.
 
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[[Image:Eroded paddock.jpg|thumb|300px|Gulley erosion]]
 
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A gully is a landform created by running water eroding sharply into soil, typically on a hillside. Gullies resemble large ditches or small valleys, but are meters to tens of meters in depth and width.
 
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[[Image:Death valley sand.jpg|thumb|300px|Mud cracks in Death Valley, USA]]
 
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A 'soil profile' is a cross section through the soil which reveals its layers.
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:O) Organic matter: Litter layer of plant residues in relatively undecomposed form.
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:A) Surface soil: Layer of mineral soil with most organic matter accumulation and soil life.  This layer eluviates (is depleted of) iron, clay, aluminum, organic compounds, and other soluble constituents. When eluviation is pronounced, a lighter colored "E" subsurface soil horizon is apparent at the base of the "A" horizon.
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:B) Subsoil: Layer of alteration below an "E" or "A" horizon. This layer accumulates iron, clay, aluminum and organic compounds, a process referred to as illuviation.
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[[Image:WayaWayasewa.jpg|thumb|300px|The islands of Waya and Wayasewa connected by a tidal sandbar, Yasawa Group, Fiji.]]
 
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;Wikipedia articles:
 
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*[[w:Alluvial fan|Alluvial fan]]
 
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*[[w:Anticline|Anticline]]
 
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*[[w:Cirque|Cirque]]
 
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*[[w:Delta|Delta]]
 
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*[[w:Glacier|Glacier]]
 
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*[[w:Mesa|Mesa]]
 
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*[[w:Morraine|Morraine]]
 
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*[[w:Oxbow lake|Oxbow lake]]
 
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*[[w:Sediment|Sediment]]
 
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*[[w:Shield volcano|Shield volcano]]
 
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*[[w:Sinkhole|Sinkhole]]
 
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*[[w:Soil profile|Soil profile]]
 
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*[[w:Spit (landform)|Spit (landform)]]
 
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*[[w:Stratovolcano|Stratovolcano]]
 
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*[[w:Syncline|Syncline]]
 
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Latest revision as of 01:44, 4 January 2023

Other languages:
English • ‎español • ‎français
Geología

Nivel de destreza

1

Año

1975

Version

25.11.2024

Autoridad de aprobación

Asociación General

Geology AY Honor.png
Geología
Estudio de la naturaleza
Nivel de destreza
123
Autoridad de aprobación
Asociación General
Año de introducción
1975
Vea también
Maestría de Conservación
Geología - Avanzado
Creacionismo - Avanzado


1

Dar el significado de las siguientes palabras:


1a

Delta



1b

Banco de arena



1c

Hundimiento de tierra



1d

Lago en un meandro (forma de herradura)



1e

Morrena



1f

Circo glaciar



1g

Meseta



1h

Abanico aluvial



1i

Anticlinal



1j

Sinclinal




2

Describir los siguientes puntos:


2a

Un volcán tipo escudo, en comparación a un volcán compuesto



2b

¿Cómo se mueve un glaciar y qué evidencias deja atrás?



2c

¿Cómo son los sedimentos establecidos por agua?



2d

Las diferentes clases de montañas



2e

¿Por qué un río o arroyo continua a menudo cavando en el exterior de una curva?




3

Saber qué clase de rocas (sedimentarias, metamórficas, o ígneas) son las siguientes:



3a

Granito


Ígnea


3b

Arenisca


Sedimentaria


3c

Conglomerado


Sedimentaria


3d

Esquito (pizarra)


Metamórfica


3e

Pizarra (roca)


Sedimentaria


3f

Mármol


Metamórfica


3g

Lava


Ígnea


3h

Caliza


Sedimentaria


3i

Basalto


Ígnea


3j

Gneis


Metamórfica



4

Tomar una fotografía o realizar un boceto de cada una de las siguientes características geológicas:


4a

Una cama de sedimento que es más tosca en la parte inferior y más fina hacia la parte superior (esto se llama sedimento normalmente graduado).



4b

Marcas de ondas en la arena o el barro (mostrar con una flecha la dirección de la corriente si es posible).



4c

Erosión en forma de canal.



4d

Grietas de barro (estas pueden ser encontradas por lo general después de una tormenta o inundación cuando el lodo comienza a secarse).



4e

Perfil del suelo a lo largo de un arroyo o de un corte de carretera (debe poder ver cómo se convierte por lo general en colores claros bajo de la superficie en el terreno).



4f

Banco de arena (barras de arena se pueden encontrar en los ríos o arroyos, o a lo largo del océano).





Referencias

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