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Pragati Kumari 7 years, 5 months ago
Dîby@Jït D@S 4&4 7 years, 5 months ago
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Nisarga Nisarga 7 years, 5 months ago
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Yogita Ingle 7 years, 4 months ago
- Top soil provides shelter for insects, reptiles, birds and animals. Further top soil is necessary for even other activities like nesting, reproduction, hatching of eggs, breeding etc.
- Soil a source of minerals: Minerals and mines present in soil is the source of many metals like iron, bauxite, zinc etc . Many metal elements are mixed up with soil and hence extracted from soil by technical processes.
- Soil is used for making utensils, tiles etc. The utensils like cups, plates china clay, plaster of paris etc. Tiles used in home or building made of ceramic like soil components.
- Soil contents like gravel, clay, sand, etc. are widely used for construction of homes, buildings, roads etc
- Soil a source medicines: Soil gives us some important mineral medicines like calcium (bones), iron (hemoglobin) bentonite (laxative) and other substance like petroleum jelly, steatite for cosmetics, talcum powders etc.<a> </a>
- Soil keeps atmosphere cool: Soil absorbs water when there is rain and so, when is there is heavy sun heat, this water from soil evaporates making the air cooler.
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Yogita Ingle 7 years, 4 months ago
Water is a precious source because all our daily activities are carried out with the help of water only. Water is found everywhere but not everywhere it is drinkable/ usable. Though the seas have no lack of water but still we can't drink or use it anywhere. Water helps in nourishment of animals and plants. We can't live without water and because it is scarce, that’s why water is precious.
Posted by Vinita Singh 7 years, 5 months ago
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Yogita Ingle 7 years, 4 months ago
Freezing mixture : It is a mixture of two or more substances (e.g. ice water and salt, or dry ice and alcohol) which can be used to produce temperatures below the freezing point of water.
Freezing mixtures are used mainly in the laboratory to generate and maintain low temperatures. Industrial requirements for low temperatures are fulfilled by a freezing mixture that consists of crushed ice and reagent grade table salt, or NaCl.
Posted by Vinita Singh 7 years, 5 months ago
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Yogita Ingle 7 years, 4 months ago
Freezing mixture : It is a mixture of two or more substances (e.g. ice water and salt, or dry ice and alcohol) which can be used to produce temperatures below the freezing point of water.
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Meghna Thapar 5 years, 10 months ago
The arrangement of metals in the order of decreasing reactivities is called the reactivity series of metals.
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Posted by Nikhil Koul 7 years, 5 months ago
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Anurag Jha 7 years, 5 months ago
Sonali Aggarwal 7 years, 5 months ago
When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water. The compound formed by the cation of the base and the anion of the acid is called a salt.
Posted by Aditi Kumari 7 years, 5 months ago
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Meghna Thapar 5 years, 10 months ago
- The method of representing a chemical reaction with the help of symbols and formulae of substances involved in it is called a chemical equation.
Posted by Force Legend Gamer 7 years, 5 months ago
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Sonali Aggarwal 7 years, 5 months ago
Most metals are good conductors of heat and they are solids at room temperature.Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.
Yogita Ingle 7 years, 5 months ago
- Mercury has high melting and boiling points making it a liquid over a broad range of temperature.
- Since it is a metal, it has a stable coefficient of expansion hence it expands uniformly and noticeably for a slight change of temperature.
- Mercury is a non sticky viscous metal and hence it makes a clear meniscus, helpful in readings.
- Mercury will not expand when it solidifies hence it doesn’t break the glass tube of the thermometer.
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Aasutosh Dubey 7 years, 5 months ago
4Thank You