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The most well-known forms of erosion are desert dunes. Limestone sediments deposited on the edges of deserts form deposits called loess

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-Abscence of vegetation and moisture that fixes materials to the ground

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-Abundance of fine loose materials

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The shaping of the landscape by the wind occurs throught aeolian processes, named Aeolus, the Greek god of wind

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They are located close to glacial areas. The temperature oscilates repeatedly above or below the melting point. This act as a type of physical weathering called gelifrication or congelefraction

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There are many remains from the last glacial period in the higuest mountain ranges of the peninsula, formed by old glaciers that have now disappeared.
We have the cirques, the U-shaped valleys, the horns, the peaks...

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As geological agents, glaciers have the following qualities:
-They have a grat capacity for erosion and transportation.
-As transportation agents, they act as large conveyor belts that don't selct by a size or rounding the sediments they pull

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Glaciers: Are enormous bodies of ice that slide with the force of gravity until areas where it melts
- Ice sheets or continental glaciers cover enormous surface areas and are kilimotres thick, as in the case of Greenland and Antarctica

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As the other agents, the sea creates landforms from erosion and deposit. In high coasts, erosion predominates; in low coasts, deposit predominates.

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It is carry out by the currents

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It is carried oit by the waves, particulary waves formed in storms .

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The geological action of the sea is seen especially on the coast. Marine shaping is also called coastal shaping. Coastal areas are dinamic and changing.
-Movements of the sea.
-Differential erosions of different types of rocks.
-sediment from rivers that the sea extends.
Intense human action
Recent changes in the sea level due to glaciations

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Shaping from surface runnoff and torrents

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Shaping from surface runnoff and torrents

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They fow without a fixed course. Their action is intense in sub-desert zones where there is esporadic, but torrential, precipitation, and the soil is unprotected as there is no vegetation.

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Cave with Satalactites, stalagmites and columns

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Cave with Satalactites, stalagmites and columns

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Karst is a spectacular landscape formed by the action of surface water and groundwater

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The contamination of ground water can be contaminated by livestock farming, industry, urban residues....

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It hapens if the volume of the water discharged is higuer than the amount that is naturally recharged

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The importance and risks of exploting ground water

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The importance and risks of exploting ground water

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Ground water makes up the 22% of all the fresh water of the Earth.
Aquifers are like ground water reservoirs

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Are layers of rock or sediment that contain and circulate groundwater

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It forms part of the water cycle and it comes of the filtration of water from the rivers, lakes, rain...

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-Upper course: rapids and waterfalls
-Midde course, lower course: meanders

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Rivers are currents of water that flow ona fixed riverbed. An ideal river has a longuitudinal profile curve.
In the high course, the erosive action makes the rivers deeper. This is where we find the V-shaped valleys , in the middle and lower courses, forming meanders , widening the river and creating U-shaped valleys

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Structural relief is formed by the alternation of resistant and soft rocks where differential erosions results in the horizontal, sloped or vertical arrangement of the rocks

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Granite are the most abundant igneous rocks in the west of the peninsula

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Studies the influence of the structure or the arrangement rocks. For example, the relief of horizontal or vertical strata

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Studies the characteristics landforms of each type of rock. For example, granite and karstic shaping

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It analyses the influence of climate and the agents related to it. For example, glacial, aeolian or desert, or fluvial shaping

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Sedimentationn, many marine organisms, especially corals that build coral reefs, deposit or separate enormous amounts of dissolved salts.

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Sedimentationn, many marine organisms, especially corals that build coral reefs, deposit or separate enormous amounts of dissolved salts.

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Photosynthetic organisms have completely changed the composition of the air. Plants play an important role in the weathering of rocks and the formation and the protection of soil 

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Photosynthetic organisms have completely changed the composition of the air. Plants play an important role in the weathering of rocks and the formation and the protection of soil 

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It influences the relief, like the type of rock, its structure or its geological history. The most resistant rocks create steeper landforms that project out from the softer rocks

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Controls the agent that shapes relief. Landforms are very different in a glacial area, in a desert area or in a warm climate. Climate also determines the type of vegetation and the presence of water

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The biosphere is a very small part of the Earth's mass, unit that interchanges a lot of matter and energy with the Earth's crust and the hydrosphere and atmosphere. 

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The biosphere is a very small part of the Earth's mass, unit that interchanges a lot of matter and energy with the Earth's crust and the hydrosphere and atmosphere. 

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Factors that condition the shaping of relief

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Factors that condition the shaping of relief

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The deposition of these particles

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Is the movement of sediments to areas where they are deposited

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External geological procceses are the different actions of external geological agents on relief

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External geological procceses are the different actions of external geological agents on relief

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Is the procces wich moves materials resulting from the weathering or that have broken off rocks

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Is the combination of cghanges or alterations that rocks experiences on the surface.