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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.
what makes a mineral a mineral? The properties of minerals: There are seven main properties that are used to describe and classify any mineral found. All seven properties are
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Observing sun spots Use the telescope that you made in a last experiment. Set it up so that it points directly at the sun and focus it so that a clear and bright image of the s
What is necessary to restore the Marshall wetland in Margibi County, Liberia? The Marshall wetland has several features , including mangrove swamp, which is being degraded in some
Another way to observe the buoyancy of water Push a large cork to the bottom of a pail of water. Notice the quantity of force you have to apply to hold the cork at the bottom.
Define EDTA Titrimetric Method for Estimation of Calcium? The amount of calcium in any sample can be estimated by EDTA titrimetric method. The principle behind this method is d
State the Pipette Method of soil The sieve analysis, though is a true particle size analysis, is unable to separate particles smaller than 20 microns. Such particles are sep
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Ask question #Minimum 100 words acceptedYou are caring for a 29-year-old woman who is married with two small children, ages 1 and 3 years, at home. She is recuperating from a left
What is permanent wilting percentage As plants absorb water from a soil, they lose most of it through evaporation at the leaf surface. Some water is also lost by evaporation d
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