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Navigation and Astronomy:
As we have said earlier, by the edd of the Middle Ages, trade on land and over the seas was being Sken up on a big scale. By the fifteenth century, the Turks had acquired a monopoly of trade routes on land. Therefore, new sea routes for trade were being explored. Great voyages were undertaken. We all know about Vasco da Gama, a Portuguese sailor, who reached India in I497 via the Cape of Good Hope in Africa. Around the same time, a great and adventurous voyage was undertaken to sail westward on the Atlantic Ocean in the hope of reaching India. Columbus, an inspired adventurer, though a penniless sailor, was able to obtain the assistance of Portuguese, Spanish, English and French courts to undertake this journey. He reached the continent, later named as America, in 1492 thinking that he had reached India. The adventure, the general excitement and ultimately, the great profitability of these voyages created great enthusiasm for building new ships and instruments for navigation. Interest in astronomy was strongly revived.
Soil Pollution: The problem of soil pollution is rapidly increasing in the rural, urban and industrial areas due to unscientific and irrational disposal of solid wastes gene
Safety spectacles : Safety spectacles need to be used where there is the slightest risk of splashes of chemicals or fragments of dust, glass, etc. getting into the eyes.
Stimulate the Making of Red Blood Cells - Function of Kidney Stimulate the making of red blood cells. Erythropoietin is a hormone responsible for maintaining the right amount o
describe the factors which decide the broad area of scientific activity?
Venus-the Clouded Planet Venus, our nearest planetary neighbour, only 40 million km away, has its surface hidden from view by a dense yellowish-white cloud, which extends to 80
Define Oxytocin Hormone - Posterior Pituitary Oxytocin is a polypeptide containing 9 amino acids. An 'oxytoxic' agent is a substance that causes the gravid uterus (uterus of a
The Fire Triangle Generally, a fire needs three things to burn: Fuel - something to bum, e.g.oi1. Oxygen - to maintain combustion. Ignition - something to start
three adaptations that help humans have differential survivability, and three adaptations that help humans have differential fecundity.
Solar energy: The energy we get today from the fossil fuels like coal, is in reality sun's energy, trapped in them millions of years ago. Plants make their food and grow bec
what is a hepar
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