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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.
The effect of rain on sloping soil Fill a shallow pan or box with firmly packed soil. Set the pan outside in the rain with one end increased slightly. Observe how the raindrops
What are the properties of a cell?
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There are many different venomous animals in the world.The venom produced by one animal can be very different that the venom produced by another animal. There are some animal venom
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To show that expired air contains carbon dioxide The two flasks are linked so that when you breathe by the T piece, all the air bubbles by the lime water in the flasks. One tub
The characteristic properties of an aquifer can be used to calculate groundwater velocities, v groundwater (L/T), according to: V groundwater = K H / η (dh/dl) where KH (L/
Determine about the Chemical weathering Chemical weathering is accelerated by the presence of oxygen, and organic and inorganic acids resulting from the microbial breakdown of p
what is the cause and effect of vulvovginitis?
The simply-supported uniform beam shown in the ?gure below supports a mass m at a distance aL from the left support. Assume that the beam is relatively mass-less compared to the ma
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