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Dunes are very large piles of sand. They form next to some sandy beaches and in sandy deserts.Most dunes have one long side. The other side is steeper. Strong winds create dunes by blowing grains of sand up the long slope.There are dunes with different shapes. Some are crescents others are lateral dunes. Lateral dunes are very long. Some lateral dunes in the Sahara Desert are over 300 kilometers long.Star dunes form where the wind blows from different directions. They have a central peak and several arms. When seen from above, they look like a star.The Arab word for a large area of dunes is “erg”. On the Sahara’s edge, Erg Chebbi is in Morocco.Erg Chebbi has only star dunes. They are very large. British researchers studied one that is 100 meters high.The researchers surveyed the dune. They took sand samples from different areas and depths.Back in their laboratory, the researchers analysed the samples. They worked out when the Sun last shone on the sand grains. The results showed that the dune is 13,000 years old. This is the first research to work out a dune’s age.
Manager’s Con Answer: No, presidents should not give an annual address. Giving a speech every year is not enough. People should always know what’s happening in their country. Nowadays, people can read or watch the news easily. Governments can inform the people about important matters daily. Leaders should talk to the people at any time.
Manager’s Pro Answer: Yes, presidents should give an annual address. It is a good way for them to report to the people. They can talk about what has happened to the country and what their plans are. People should know what’s happening in their country. They need to know what their government plans to do.