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Paragraph on “How do we know what the bottoms of oceans are like?” complete paragraph for Class 9, Class 10, Class 11 and Class 12

How do we know what the bottoms of oceans are like? Over two-thirds of the Earth’s surface is covered with water. Most of this is very deep and we call it ocean. People cannot go down very far because the pressure of the water on them increases the deeper they go. Deep-sea divers wear protective clothing to stop their bodies being crushed. However, people have gone down to great depths using...
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Paragraph on “Can water climb?” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Can water climb?   Water usually flows downwards, pulled by the force of gravity. However, in certain circumstances, it can move upwards or climb! If you place a thick and a thin plastic straw in a beaker of coloured Water, the water will rise up the straws above the level of the water in the beaker. The water will rise further up the thin straw than the thick straw. The ability...
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Paragraph on “Who invented the game of tennis?” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Who invented the game of tennis?   A Welshman, Major Walter Clopton Wingfield devised the game of tennis in 1873. However he based his ideas on a much earlier form of court tennis whose origins date from ancient Egyptian-Arabian fertility rites.  The game was played intermittently up until the thirteenth century, from which time  it is known that it became a popular pastime in  the parks and chateaux of France. It...
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Paragraph on “How is a cuttlefish like a jet plane?” complete paragraph for Class 9, Class 10, Class 11 and Class 12

How is a cuttlefish like a jet plane?   The cuttlefish moves underwater and the jet plane moves through the air, but both use the same method — jet propulsion. The cuttlefish has a bag or cavity into which it lets water. When it is full, muscles in the cavity stop any more water coming in and push the water out of an opening in the back of the cuttlefish. It...
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Paragraph on “How do waves erode cliffs?” complete paragraph for Class 9, Class 10, Class 11 and Class 12

How do waves erode cliffs?   The wind blowing over sea produces waves. These waves pound all around our coastline. They can wear, or erode even the hard rocks in cliffs, but this takes a very long time. There are two main ways in which this erosion occurs. The cliffs are not smooth but have lots of holes and crevices in them. When the waves pound against the cliffs, the air...
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Paragraph on “How does the Moon cause tides?” complete paragraph for Class 9, Class 10, Class 11 and Class 12

How does the Moon cause tides? The Earth is attracted lo every in space by the force of gravity. This is a force between objects which depends on how heavy they are and how far apart they are. The force is greater the heavier and closer together the objects are. The Moon is our closest neighbour. It orbits around the Earth at an average distance of 384,400 km  and  238,7o0 km...
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