Transcript moraines - javiiesmarmenor

The geological action of water II
(La acción geológica del agua)
Water shape the Earth´s surface through its movements in surface runoff,
rivers, seas, glaciers and underwater stream.
- Surface runoff or wild waters (Aguas de arroyada o
aguas salvajes )
- Rivers (ríos)
- Glaciers (glaciales)
- Sea (el mar)
The parts of an alpine glacier
An alpine glacier is a glacier formed on mountainsides and
moves downward through valleys.
Alpine Glacier
Cirque
Moraines
Tongue
Lateral moraines
Medial moraines
Ground moraines
Terminal moraines
U-shaped valley
Glaciers (glaciares)
glaciers are large masses of ice in movement,
descending valleys from higher zones until
they reach levels where they begin to thaw.
The glacial erosion is due to
friction of the rocks transported by
ice against rock.
Striations (estrías): the hardest pieces
of rock carried by the ice scratch
(friction) the sides of the valley causing
striations.
CIRQUE
GLACIER
(Circo de un
glaciar)
A cirque is a depression surrounded by mountains where the snow
accumulates and through compression it becomes ice.
Tongue
Cirque (accumulation zone)
The mass of ice wich slides down the valley is the
tongue (lengua de un glaciar).
Tongues
Cirques
MORAINES
(morrenas):
The accumulation of rock fragments are
called moraines, these fragments are
transported and deposited by the action
of the glacier.
Depending on their position, these are
classified as lateral, medial, ground and
terminal moraines (morrenas laterales,
centrales, de fondo y frontales,
respectivamente).
Terminal moraines
Medial moraines
U-Shaped Valley
Glaciers form a characteristic valley with the shape of a “U”.
U-Shaped Valley
What parts of an alpine glacier
can you distinguish in the picture
on the left side?
What has been
happening in the picture
to the right?