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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.
Origin of life on the earth: Man has always wondered how he came into existence, who created him, and why he was created. Curiosity in this connection has been so strong that
What layer of the earth does magma form? Magma is part of the layer just under the crust. It tell us that while everything seems solid underfoot in fact that is not quite so
Photochemical Smog: Photochemical smog, a secondary Pollutant, results when the two pollutants, nitrogen oxide and hydrocarbons found in automobile exhausts, react with
what are alveoli?
Sketch the water surface profiles for the cases below. Label the normal and critical depth lines as well as all of the water surface profiles. In part (b), the conjugate de
1000 words
Give a rock name for sample. Note that the colour of this type of rock varies greatly, depending on the abundance of organic matter and iron oxides. Samples are both carbonate rock
#question.introducion.
in honey if fieshe''s test is negative then is it required to perform the hmf test. kindly let me know the relation between te two
What does regolith mean? Ans) This refers to a layer of loose surface material covering bedrock.
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