Externaldynamics
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Externaldynamics

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Externaldynamics Externaldynamics Presentation Transcript

  • EXTERNAL DYNAMICS OF THE EARTH
  • Landforms Landforms are the geographical features which can be observed on the Earth’s surface. They are dynamic, caused by the opposing action of : - Internal Processes: built and lift. - External Processes: shape.
  • El Relieve Continental
  • El Relieve Oceánico
  • GEOLOGICAL AGENTS Natural elements which cause the geological processes, modelling the Earth’s surface. • Water. • Ice. • Wind. • Living Things. • Gravity.
  • GEOLOGICAL PROCESSES • Weathering: • Physical. • Chemical. • Biological. • Erosion. • Transportation. • Sedimentation.
  • Physical Weathering Thermal-stress Weathering Cryofracturing
  • Chemical Weathering • Hydrolysis. • Carbonation. • Dissolution. • Oxidation.
  • Biological Weathering • Caused by living beings, it can be physical or chemical.
  • TRANSPORTATION
  • SEDIMENTATION AND FORMATION OF SEDIMENTARY ROCKS Sedimentary rocks are formed from sediments (rocky materials eroded and deposited by a geologic agent), through a process called Diagenesis.
  • AGUAS SALVAJES Y MODELADO TORRENCIAL
  • Aguas Salvajes
  • Modelado Torrencial
  • MODELADO FLUVIAL
  • Perfil Longitudinal de Un Río
  • • Tramo Alto: predomina la erosión (energía alta): Valles en V
  • • Cascadas • Gargantas, desfiladeros • Marmitas de Gigante
  •  Tramo Medio: predomina el transporte (terreno de baja pendiente).  Llanuras de Inundación o Penillanuras.  Terrazas aluviales.
  • • Meandros
  • • Cerro Testigo.
  • • Cantos rodados.
  • • Tramo Bajo: predomina el depósito. • Deltas
  • • Estuarios y Marismas.
  • MODELADO GLACIAR Glaciares: • Alpinos • Islandis
  • Formas de Erosión • Valle Glaciar. • Circo. • Lago (ibon). • Estrías.
  • Formas de Depósito: Morrenas
  • Modelado Kárstico Causado por la disolución de la roca caliza al entrar en contacto con agua rica en dióxido de carbono. H2O + CO2  H2CO3 CaCO3 + H2CO3  Ca2 + 2HCO3
  • LAPIAZ
  • DOLINAS Y UVALAS
  • SURGENCIAS
  • TRAVERTINOS: Formas de depósito.
  • Modelado Costero • Formas de Erosión • Acantilados. • Plataforma de Abrasión. • Arcos. • Islotes
  • • Formas de Depósito Flecha Tómbolo Albufera
  • Relieve Eólico • Formas de Erosión. • Alveolos. • Reg. • Rocas Fungiformes.
  • • Formas de Depósito. • Dunas • Loess
  • Acción Biológica
  • FACTORES CONDICIONANTES DEL MODELADO DEL RELIEVE • Climáticos. • Tectónicos y Estructurales. • Litológicos. • Antrópicos.