The sand is primarily derived from weathering of Cretaceous sandstones in North Africa. When these sandstones were deposited in the Cretaceous, the area where they are now was a shallow sea. The original source of the sand was the large mountain ranges that still exist in the central part of the Sahara. These mountains are volcanic and intrusive, and the granite rock weathers out to leave behind quartz sand grains that are carried by rivers to the sea. These sand deposits eventually formed into sandstone, and as they were uplifted began to weather and break down into sand again.
Only about 10% of the Sahara is actually covered by sand, and parts of the Sahara are in fact covered by soil. More than half of the area comprises soils known as yermosols, with shallow profiles over gravel or pebble beds. These soils have been developing over the past 50 million years.
current literacy rate of China is 96.8%
raditionally, marriage is a family affair and is at least partly arranged by parents. Among matrilineal families, the preferred marriage partner is a cousin—one of
<span>Public holidays include New Year’s Day (1 January); the Commemoration of the Martyrs of Independence (4 January); Easter; Labor Day (1 May); Promulgation of 1967 Constitution and Day of the Fishermen (24 June); Independence Day (30 June); Parents’ Day (1 August); and Youth Day (14 October). Veterans Day is observed on 17 November and the Anniversary of the <span>Second Republic</span> on 24 November. Christmas Day is celebrated on 25 December.</span>
Answer: The answer is Hot spots cause volcanoes
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