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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.
How to prevent the erosion of topsoil Use the trays constructed for the experience above. (a) Fill the trays with loose soil and tilt everyone the similar amount. Make furr
Explain the Urinary Bladder The urinary bladder is a sac, which acts as a reservoir for urine. You would realize that the size and position of the urinary bladder varies depend
Vitamin E (Tocopherols) Vitamin E is an essential fat-soluble vitamin that functions, at least in part, as a lipid- soluble antioxidant. Presence of vitamin E was first revea
principle of EDTA..
Explain Nervous Phase of Pancreatic Secretion Nervous phase: When stomach secretes gastric juice in cephalic phase and gastric phase, nerve impulses are simultaneously transmit
THE HEART PUMPS BOODS EVERY MINUTE AND EVERY SECOND OF THE DAY WITHOUT RESTING
if the moon is 240000 miles from earth how far is that in scientific notation.
Importance of nutrition: We cannot live without food. Our hunger can be satisfied by any kind of meal, but to remain healthy and free of disease, our body requires certain kin
life span of a roundworm
For chemically reactive wastes : The chemical property of the waste could be used in its removal in a number of ways as given below: i) Some water-reactive waste could be dispo
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