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The Sun is the most important star from our point of view. It is the only star close enough to be studied in considerable detail. The grandeur of the Sun is partly because of its size. Its diameter is almost 110 times that of the Earth. We can best visualise the volume of the Sun if we realise that more than a million earths can be dropped into the space it occupies. As we have said above, the mass of the Sun is about 2 X 1033 grams, which makes it more than 300,000 times the mass of the Earth. The average density of the Sun, i.e.. its mass per unit volume, is about 1.4 g/cm3.
Although the Sun appears to be unchanging, it rotates about its axis once every 25 days. From time to time dark patches appear on the surface of the Sun, usually in pairsor in groups. These dark patches are called sunspots. Their movement is an indication of the Sun's rotation. This fact was recognised for the first tiine by Galileo. Actually, a sunspatis a regiim cn the surface of the S& that consists of gases almkt 10000c cooler than those surrounding the area. The number of sunspots increases and decreases in a cyclc every 11 years. In the long term, there are periods of low number of sunspots and High'number of sunspots.
What is a covalent crystal? A covalent crystal is one in which the lattice structure is held together by powerful covalent bonds. These crystals tend not to be soluble in water
Diagnosis and Prognosis: The diagnosis and prognosis of disease were done directly by seeing, hearing, smelling and touching all external human organs and human waste and of
STERILIZATION OF GLASSWARE Activity is related activities. Whenever you require the glassware for doing an experiment you can follow the procedure given in Activity independent
Explain the law of diminishing return. The increase in the yield by a unit increase of the deficient factor is proportional to the decrease from maximum.
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Health food online store In today's world when almost everything has become easy with just a click on the mouse, even shopping for normal groceries has been revolutionized by m
Define Nutrition To common man, the word 'Nutrition' implies food. Food is essential for growth and development. Physiology becomes an interlink between nutrition and healthy h
Riboflavin Riboflavin has two major coenzyme derivatives, namely in mononucleotide (FM) which is the active component of riboflavin and is formed by the addition of a
Describe the history of rock cycle? We will follow the full rock history, or "life-cycle", of a piece of granite in the Sierra Nevada mountains of California. The life cycle of
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