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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.
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.
EROSION • The materials weakened by weathering are removed.
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.
Tramo Medio: predomina el transporte (terreno de baja pendiente). Llanuras de Inundación o Penillanuras.
Terrazas aluviales.
• Valle Glaciar.
• Ibon.
• Tillitas.
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
• Galerías. • Simas. • Cuevas.
• ESTALACTITAS Y ESTALAGMITAS. • COLUMNAS.
Modelado Costero • Formas de Erosión (por abrasión).
• Acantilados. • Plataforma de Abrasión. • Arcos. • Islotes
• Dunas
• Loess