Transcript Sand Dunes

Sand Dunes: Heap and mound of sand found in the desert area is
called as sand dunes. These sand dunes move slowly towards the
direction of the wind.
There are two types of sand dunes:
i) Longitudinal Sand Dunes, and
ii) Transverse Sand Dunes.
A crescent shape [semi-circular] sand dune is called as ‘Barchan’.
High speed wind in the desert blow out the sand and gravel from
an area. Large gravel remain in the basin. The depression formed
by this process is called deflation basin.
In the desert area, some rocks are found vertically standing. Their
lower parts are eroded from all side very quickly by the wind
compared to upper part because erosional tools [sand and
gravels] blow with wind in the lower part as they are heavy. After
sometimes, the rock look like a mushroom and it is called
mushroom rock.
Sometimes, light and fine particle of sand are blown up to a great
distance and their deposition make leveled plain that is called as
loess. In other words, plain formed by wind due to deposition of
fine particle of sand is called as loess. Loess plain of China is the
best example.
In the desert area, a basin between the mountains is called as
‘Balson’. In other words, basin in the desert is called balson.
The rocky land from the foothill of the mountain towards the basin
is called as ‘Pediment’.
A temporary lake formed due to numerous streams coming from
the mountain to basin during the rainy season is called as ‘Playa’.
Playa [Lake]
Mountains
Pedimont
Mountains