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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.
Stroke A patient has experienced a bleed in the left frontal lobe of their brain. Describe the changes that are likely to affect motor function after this bleed. Mobility, re
Freezing Systems Different types of freezing systems are available for foods. No single freezing system can satisfy all freezing needs, because of the wide variety of food pro
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A rain gauge Mount your wind speed indicator in a place that is exposed to the wind from all directions. 4 A rain gauge It is simple to make a easy rain gauge using a funnel an
Personal sensitivity : There are other dangers from substances which are not so common. e.g. mutagens , but one aspect we have not mentioned involves you. The eyes, lungs and skin
Holding water in a sieve Pour some oil over the wire mesh of a kitchen sieve and shake out the overload so that the holes are open. Cautiously pour water into the sieve from a
Placement of First Aid Box : All first aid equipment should be placed close to the sites where accidents are likely to occur. The location of first aid boxes should be such that t
what are some easy examples of a solstice
Explain Nerve Supply of the Gastrointestinal Tract The gastrointestinal tract is supplied by nerves from both sympathetic and parasympathetic nervous system. The parasympatheti
Political role of communication Communication has an Important role in political and social awakening. During our freedomstruggle, the leaders communicated with the people di
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