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Erosional Landforms

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        individualName:  Heather McCullough
        organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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                deliveryPoint:  NOAA/NESDIS/NGDC E/GC3 325 Broadway
                city:  Boulder
                administrativeArea:  CO
                postalCode:  80305-3328
                country:  USA
                electronicMailAddress:  Heather.McCullough@noaa.gov
            hoursOfService:  7:30 - 5:00 Mountain
            contactInstructions:  Contact Data Center
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    dateStamp:  2011-04-06
    metadataStandardName:  ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
    metadataStandardVersion:  ISO 19115-2:2009(E)
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    identificationInfo:  (MD_DataIdentification)
        citation:  (CI_Citation)
            title:  Erosional Landforms
            date:  (CI_Date)
                date:  1994
                dateType:  (CI_DateTypeCode) publication
            edition:  First
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                organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp)
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                organisationName:  National Geophysical Data Center
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                    address:  (CI_Address)
                        city:  Boulder
                        administrativeArea:  CO
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        abstract:  The hydrologic system, which includes all possible paths of motion of Earth's near-surface fluids including air and water, is largely responsible for the variety of landforms found on the continents. Heat from the sun evaporates water from oceans, lakes, and streams. Although most of the water returns directly as precipitation to the oceans, some of the water is precipitated over land as rain or snow. If it is precipitated over land, it then begins its journey back to the sea as runoff. The relentless action of surface runoff, streams, and rivers, glaciers, and waves sculpts the rock into intriguing and bizarre shapes. This set of slides includes examples of wave erosion, wind and water erosion, valley shapes, and glacial erosion. The views are often dramatic. Many were taken at U.S. National Parks and Monuments. Water Erosion of Horizontal Strata in Semiarid Lands After the horizontal strata in today's semiarid landscapes were deposited, they were uplifted, twisted and cracked, forming joints-parallel fractures in the brittle rock. These joint systems are made vulnerable to weatheringand frost wedging by the erosion of the overlying resistant layers. As the joints and fractures widen, rock fins are produced. In addition to fins, large flat areas called plateaus may be eroded along joints into smaller flat topped mesas and still smaller buttes. Buttes are further eroded into pillars and pinnacles. Slabs of rock may break away between two joints in a fin so that an alcove (a recess) forms. As the alcove enlarges, a small window may be produced in the cliff face. Weathering then proceeds inward from all surfaces. As weathering removes the rock surface, pressures locked within the formation itself are released, breaking off more rock flakes. Rock falls from the ceiling of the opening, and the span thins and elongates. These erosive forces-dissolution, frost action, and release of compression-eventually enlarge the window in the fin, creating an arch. Variability in the cementing materials and the rock structure in the arch floor, buttresses, or ceiling determines the size, shape, and age of the arch. The shape and size of the arches changes over time, and the forces that created an arch finally destroy it, leaving goblin-like columns. Wave Erosion Coastal areas are bombarded by water in constant motion. Although wind and/or storm-generated waves, tides, and tsunamis all play a role insculpting the shoreline, the relentless motion of waves is perhaps the most important of these factors. These waves are generated by the wind at sea. As the wave approaches the shore, it breaks, and the surf surges on shore causing erosion, transportation, and deposition in beach areas. The breaking waves transporting sand and gravel encounter the headlands and powerfully abrade them horizontally forming platforms, cliffs, alcoves, and caves in the rock. River SystemsA river system functions as a unified whole, adjusting its profile to establish equilibrium among the factors that influence flow. These factors include discharge, velocity, topographic gradient, base level and load. Although downcutting by the stream is slow on resistant rock units, it occurs more rapidly than erosion and mass movements of the slopes. As a result, vertical-walled canyons develop. But if slope processes keep pace with downcutting, the landscape is characterized by smooth rolling hillsand valleys. Initial dissection and slope retreat occur as a result of uplift. Slope retreat causes non-resistant rocks to recede from the river so that terraces are left on resistant rock layers. GlaciationA prerequisite for glacier formation is that more snow accumulates than melts in the period of a year. Ice sheets have covered major portions ofthe continents, and valley glaciers have formed and melted in many of the mountainous regions of the globe. When these glaciers melted, they haveleft behind an altered landscape. The glaciers alter pre-existing river patterns. They scour mountain tops, valleys, and continental surfaces, transport the eroded particles, and finally leave behind the removed material as glacial deposits.
        purpose:  To provide long-term scientific data stewardship for the Nation's geophysical data, ensuring quality, integrity, and accessibility.
        credit:  Patricia Lockridge
        status:  (MD_ProgressCode) completed
        pointOfContact:  (CI_ResponsibleParty)
            individualName:  Heather McCullough
            organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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                    voice:  (303) 497-3707
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                    deliveryPoint:  NOAA/NESDIS/NGDC E/GC3 325 Broadway
                    city:  Boulder
                    administrativeArea:  CO
                    postalCode:  80305-3328
                    country:  USA
                    electronicMailAddress:  Heather.McCullough@noaa.gov
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            fileName: http://www.ngdc.noaa.gov/hazard/icons/small_res/24/24_497.jpg
            fileDescription:  This valley is one that was greatly modified by glaciers during the last ice age. A valley glacier commonly fills more than half of the valley length, and as it moves, it modifies the former V-shaped stream valley into a broad U-shaped or trough-like form. The head of the valley is sculptured into a large amphitheater called a cirque (visible in the middle background). Where several cirques approach a summit from different directions, a sharp, pyramid-shaped peak called a horn is formed (middle background). The projecting ridges and divides between glacial valleys are subjected to rigorous ice wedging, abrasion, and mass movement. A knife-edged ridge (arete) is the result of glaciers coming together from opposite directions (from left to middle of photo) Moraine material composed of rock fragments is created from glacial erosion. A truncated spur is visible on the right side of the photo just above the tree-covered ridge.
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            keyword:  EARTH SCIENCE > LAND SURFACE > Erosion/Sedimentation > Entrainment
            keyword:  EARTH SCIENCE > LAND SURFACE > Erosion/Sedimentation > Erosion
            keyword:  EARTH SCIENCE > LAND SURFACE > Erosion/Sedimentation > Weathering
            keyword:  EARTH SCIENCE > SOLID EARTH > Tectonics > Faults
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            keyword:  Lithosphere > Seismic activity > Seismic activity
            keyword:  Lithosphere > Wind erosion > Wind erosion
            keyword:  Marine environments > Coastal ecosystems > Coastal erosion
            keyword:  Terrestrial ecosystems > Soils > Water erosion
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            keyword:  WDC/MGG, BOULDER > World Data Center for Marine Geology and Geophysics, Boulder
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            otherConstraints:  Access Constraints: None Use Constraints: None Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
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                        deliveryPoint:  NOAA/NESDIS/NGDC E/GC 325 Broadway
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                        postalCode:  80305-3328
                        country:  USA
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                fees:  $25.00 plus handling and shipping outside the USA
                orderingInstructions:  Non-Digital Form: 35 mm slides; Erosional Landforms Ordering Instructions: Product may be ordered from the online store via: http://ols.nndc.noaa.gov/plolstore/plsql/olstore.prodspecific?prodnum=G01217-SLI-A0001 Custom Order Process: Contact Data Center
                turnaround:  4 Days
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                orderingInstructions:  Ordering Instructions: Product may be downloaded via: http://www.ngdc.noaa.gov/nndc/struts/results?eq_1=24&t=101634&s=0&d=4&d=44 Custom Order Process: Contact Data Center
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                orderingInstructions:  Ordering Instructions: Product may be ordered from the online store via: http://ols.nndc.noaa.gov/plolstore/plsql/olstore.prodspecific?prodnum=G01268-CDR-A0001 Custom Order Process: Contact Data Center
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        maintenanceNote:  This metadata was automatically generated from the Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata standard version FGDC-STD-012-2002 using the June 2011 version of the FGDC RSE to ISO 19115-2 transform. The Spatial Reference Information is not currently mapped over to ISO but will be mapped in future versions.
        contact:  (CI_ResponsibleParty)
            individualName:  Heather McCullough
            organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
            contactInfo:  (CI_Contact)
                phone:  (CI_Telephone)
                    voice:  (303) 497-3707
                    facsimile:  (303) 497-6513
                address:  (CI_Address)
                    deliveryPoint:  NOAA/NESDIS/NGDC E/GC3 325 Broadway
                    city:  Boulder
                    administrativeArea:  CO
                    postalCode:  80305-3328
                    country:  USA
                    electronicMailAddress:  Heather.McCullough@noaa.gov
                hoursOfService:  7:30 - 5:00 Mountain
                contactInstructions:  Contact Data Center
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