In this Geoshortqa we are going to know about types of Sand Dunes. Types of Sand Dunes, Geoshortqa Sand Dunes Sand dunes are heaps of sand found in deserts . Generally , their heights vary from a few metres to 20m , but in some cases dunes are several hundred metres high and 5 to 8 km long . The formation of sand dunes requires • Wind of high velocity • Abundant sand • Obstacles such as trees , bushes , forests , rock outcrops , walls against , which dunes may settle • Ideal places i.e. dune complex , dune colony or dune chain . Dunes formed due to obstacles like hushes , walls etc. are called nebkhas , where dune formed besides desert depressions are called lunettes. Dunes are classified on the basis of morphology , structure , orientation , location , internal structure , ground pattern and number of slip faces . These are the various types of sand dunes a) Transverse Dunes are dunes deposited transverse to the prevailing winds direct...
In this Geoshortqa we know about Seven Seas of the world.
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| Seven Seas, geoshortqa |
"Sailing the seven seas" I'd familiar phrase in literature and song, but are there seven sea? To the ancients, the term "seven" often meant "many" and before 15 th century, Europeans considered the main seas of the world to be :
Seven Seas of the world
The Red Sea
The Mediterranean Sea
The Persian Gulf
The Black Sea
The Adriatic Sea
The Caspian Sea
The Indian Ocean
Today, the world ocean is generally divided into the four principal oceans plus one. If the ocean are counted as sea and the Pacific and the Atlantic Oceans are arbitrarily split at the equator, a more modern count of the seven "seas" would be
i) The North Pacific,
ii) The South Pacific,
iii) The North Atlantic,
iv) The South Atlantic,
v) Indian Ocean,
vi) The Arctic and
vii)The Southern or The Antarctic
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