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Posts tagged "Science Facts" (Page 36)
Mars the ‘Red Planet’ Mars, the fourth planet has a diameter of 6,794 kilometres and it orbits at a distance of 228 million kilometres from the Sun. The surface gravity on Mars is 0.38 of the Earth’s gravity and the planet is about one tenth the size of the Earth. Mars moves at a speed of 24 kilometres per second and takes about 780 days to complete one revolution around the...
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September 26, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
Saturn and its Rings Saturn is the sixth planet, in order of revolution, in the family of the Sun. It has a diameter of 1,20,536 kilometres and is located in orbit about 1427 million kilometres away from the Sun. Saturn is about 95 times larger and has a surface gravity of 1.16 as compared to Earth. Moving at a speed of 9.6 kilometres per second it takes about 30 years to...
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September 26, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
The Movement of Planets around the Sun All planets in the Sun’s family were probably formed from the same spinning cloud of material from which the Sun was created. This could probably explain the reason why they move in the same direction while rotating on their axis’. This movement is necessary, if the planets did not move at just the right speed depending upon their distance from the Sun, they would...
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September 26, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
The Sun and its Family The Sun, as we see it, is a huge ball of very hot gas measuring about 1,380,000 kilometres in diameter. Dark spots can often be seen on the Sun’s surface, these are known as Sun spots and they come and go frequently. These spots stand out as dark patches since they are cooler as compared to the hot area by which they are surrounded. Huge...
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September 26, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
Galaxies and Stars It is said that a very powerful explosion took place billions of years ago which resulted in the formation of the galaxies. Galaxies contain dust, gas and thousands of millions of stars. These galaxies are gradually moving away from each other since the Universe is constantly expanding. On a clear night we can see thousands of stars in the skies. Most of the stars we see belong to...
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September 26, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
The Earthquakes and its measurement The tremors produced by an earthquake can be measured by using sophisticated instruments called ‘ Seismographs’ it shows earth tremors as wriggles in hire traced on a turning drum. A tremor vibrates the weight that holds the tracer. The seismograph then gives a number with a decimal point to rate the earthquake. The intensity of the earthquake is measured on the Richter Scale, an established scale...
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September 26, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
Ice Properties Water has the property of expanding by about one- ninth of its volume when it freezes. Ice, therefore occupies more space than water. Pipes which are wide enough for the water to flow, become small for the ice. And since they cannot stretch, they crack open. This enormous power of frozen water is used in quarries to loosen up great blocks of rocks.
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September 26, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
Salt properties Water is a polar molecule having both positive and negative ends. A salt crystal is also held together by the force of attraction between positively charged sodium ions and negatively charged chloride ions. When a salt crystal is put in the water, the positively charged hydrogen ends (H+) of the water molecules get attracted to and surround the negatively charged chloride ions (Cl–). Thus the negatively charged oxygen ends...
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September 26, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
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