Topics in TOEFL iBT

Sand Dunes
 
I am sure that all of you can imagine what the deserts are. When we hear about the word â?odesertsâ?, we might think about the places which are very hot and contain huge quantities of sand. However, have you ever been wondering where enormous volumes of sand come from?Well, I will replace all of you to answer this question. HIHI. The large amounts of sand are eroded from mountains and carried to the desserts by wind and water. Hmm, I bet these processes are occurred incessantly through thousands of years. Do you agree with me that it is an amazing phenomenon? By the way, deserts are formed like that.
 
Well, in reality, my main topic today does not mention about deserts. I am very exciting to introduce to you SAND DUNES of various shapes. Now, letâ?Ts explore the whole of desert and find out the mysterious things in it.
 
After spending a lot of money and 2 days traveling by plane, I come to Sahara eventually. The Sahara is actually not a desert, but many deserts, distinct and different in nature and landscapes.
 
First thing I can see, as I put my foot in deserts, is â?oCrescent dunesâ?. The word â?ocrescentâ? represents for the moon in her first quarter. Crescent dunes form on the edges of deserts where there is less sand and where the winds blow mainly in one direction. Well, there is an interesting thing about these dunes. They can shift as much as 20 meters per year by the wind. OH! Crescent dunes seem to have feet.
 
As we known, â?oCrescent dunesâ? are formed at the place where there is less sand and where the winds blow in one direction. On the other hand, â?oStar-shaped dunesâ? are formed at the place where there are massive amounts of sand and where the winds blow in different directions. For one thing, â?oStar-shaped dunesâ? are more stable than â?oCrescent dunesâ?. Well, it means that Star-shaped dunes donâ?Tt have feet to run. HEHE. However, we will not disregard these dunes when they can reach incredible heights, up to 80 meters high. Of course, they are quite common in massive deserts such as Sahara.
 
If â?oCrescent dunesâ? form on the edges of deserts, â?oRidge dunesâ? form generally in the interiors of deserts where the winds blow in one direction. In the eyes of these con***ions, parallel ridges of sand form at right angles to the wind.
 
HUHU. Our deserted expe***ion is over. I must catch a taxi to the airport. Hopefully, I have enough money to get plane ticket for going back Vietnam. See you soon!!!
 

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được alexanderthegreat sửa chữa / chuyển vào 16:39 ngày 29/06/2008