From watching cinema films, you could be forgiven for thinking that all deserts are covered by sand. However, sand deserts make up only a fifth of the world’s desert. The rest are covered by small stones or just bare rock. Desert landscapes are called by Arabic names. Sand desert is called erg, stony desert reg, and areas of bare rock …

Dogs are what we call domesticated animals, meaning that for thousands of years they have played a very close and important part in men’s lives. One of the most valuable jobs a dog can be trained for is to act as a guide dog. These dogs are owned by blind people and lead the way when they want to go …

The ‘overgrown lizard’ is that most frightening of extinct animals. Tyrannosaurus Rex. There were some dinosaurs even larger than Tyrannosaurus, but they were harmless, placid, grazing animals. Tyrannosaurus was a carnivore a meat eater and its breakfast was probably another, less powerful dinosaur. Thanks of fossil remains, we have a good idea of what this monster looked like. It stood …

As a result of Tasman’s discoveries, Australia, Tasmania and New Zealand were thought to be part of one enormous continental island. It was shown on maps of the time as Terra Australis Cognita (or Southern Known Land) separated from another to the south shown as Terra Australis Incognita (or Unknown). Captain Cook, however, proved that the former was not one …

Suppose that today is February 13, 2053. The day of the week is a Thursday. One week (seven days) from today, on February 20, 2053, it will be Thursday again. After two weeks (fourteen days), it will be Thursday once more. We need to figure out how many weeks and days will have passed after a year. 2053 is not …

In 1934, people in the city of Boston in the north-eastern USA watched in amazement as clouds of choking yellow dust passed over them on their way to the Atlantic Ocean. The dust had come from the Great Plains in the American Midwest. These plains are generally treeless, because the average yearly rainfall is less than 500mm (20 in) and …

Most people have dark eyes, usually brown. These people usually have dark hair. People with blue eyes tend to have fair hair.

Whirlpools are a threat to small boats. The whirlpools between Sicily and mainland Italy, named Scylla and Charybdis, were once thought to be the lairs of sea monsters that swallowed ships. Whirlpools are often caused when strong currents are confined between rocks or when two currents meet.

तालाब किनारे राेती थी, कल बिटिया इक बैरागन की, जब जालम कागा ले भागा, बिन पूछे टिकिया साबुन की। ये बाल भी लतपत साबुन में, पाेशाक भीतन पर नाजक सी, था अब्र में सूरज भी पिनहां, आैर तेज हवा थी फागुन की। आंचल भी उसका उड़ता था, आैर हवा के संग लहराता था, इक हाथ में दामन थामा था, इक …

Tidal waves, or tsunami, as scientists call them, are very often the result of earthquakes on the bottom of the ocean. The sea bed shifts and slides like an earthquake on land, causing a great shock wave. Ships that are in the area of the quake fell this shock wave as if they had just struck a rock. Sometimes the …