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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.
State the categories of bulky organic manures These are evaluated mainly on the basis of their nitrogen content and the amount of organic matter present in them. The two import
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Define Co-transport - Secondary Active Transport Determine If the two substances whose transport is coupled, move in similar direction, the phenomenon is known as co-transport
Analysis soil texture by Feel Method Soil texture was recognised from very early times by experienced farmers from the "feel" of moist soil placed between the thumb and the for
Laboratory Method of Soil textural classes The mechanical analysis methods have been used by USDA to develop a method for naming the textural class. This is depicted by a trian
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explain the factors that led to the decline of science in europe during iron age
Question 1 Discuss the efforts introduced to manage of air and water pollution Question 2 Comment briefly on agricultural practices in Arid zone Question 3 Anal
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