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About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water with 29% of land .
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Yogita Ingle 7 years, 6 months ago
Animals in the mountain habitat have thick coat of fur. This helps in keeping them warm during very cold winters.
The mountain goats have strong hooves which help them in running along the mountain slopes.
Yak and snow leopards are common examples of animals in the mountain habitat.
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Yogita Ingle 7 years, 6 months ago
Melting of ice is a physical change because it involves change only in the physical state of water, from ice in the solid state to water in the liquid state. Moreover, no new chemical substance is formed in the process and this change is reversible. Water can be converted back into ice simply by freezing. Hence melting of ice is a physical change.
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Yogita Ingle 7 years, 6 months ago
Advantages of Sorting Material
Disposal: For proper disposal of objects, it is important to sort them into groups of biodegradable and non-biodegradable substances. For degradable substances, dry waste and wet waste should also be separated to ensure longer decay time during the transit period. For nondegradable substances, the objects should be sorted into recyclable and nonrecyclable substances, so as to reduce wastage of material.
Storage: In order to allocate suitable containers for storage of objects, it is necessary to sort objects into solid, liquid and gases. For example, vegetables can be carried in cloth bags, but milk and oil cannot. Liquids such as oil and milk can be stored in open mouth containers such as a glass tumbler, but gases such as nitrogen and oxygen cannot be stored as such.
Manufacturing: The material of an object can be identified depending upon its property. For example, if we want to manufacture bottles to store liquids, we use materials such as a glass, plastic or metal but cannot use cloth or leaves, as they will not retain the liquid. Similarly, while manufacturing cricket bat, we can use wood or plastic, but cannot use glass.
Usage: In order to make proper use of substances, we need to classify them on the basis of their physical and chemical properties. For e.g. lemon juice and tamarind can be used as souring agents while cooking, but sugar cannot be used for the same.
Posted by Samruddhi Jambhulkar 7 years, 6 months ago
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Roughage is simply referred as dietary fiber. It is the indigestible portion of food obtained from plants. Functions of roughage: Its main function is to add bulk to the diet, which in turn helps in the digestion process and healthy function of the bowel system.
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Yogita Ingle 7 years, 6 months ago
Hand picking is the method of separating easily identifiable material from a mixture. The components of the heterogeneous mixture can be separately identified from each other. And they can be separated from each other by by using hand picking. This method is used only when unwanted material is in small quantity. Moreover, shape, size, or colour of the unwanted material is different from that of the useful materials.
example: In our house, our mother separates stones and insects from rice simply by hand.
Pebbles, broken grains and insects are separated from rice, wheat and pulses; by handpicking.
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Anshika Simon 7 years, 6 months ago
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