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How to prevent the erosion of topsoil
Use the trays constructed for the experience above.
(a) Fill the trays with loose soil and tilt everyone the similar amount. Make furrows with a stick running up and down the hill in single box and across the hill in the other box. Sprinkle each the similar amount. Observe the erosion in every case and the run-off water.
(b) Again fill the trays with loose soil. Water them unless there are well-defined gulleys formed from the running water. Now block the gulleys at intervals with little stones and twigs. Again water and observe the effect of blocking the gulleys
Eight students conducted a controlled experiment to demonstrate how walking and running affected their heart rates. Use the data below to answer the following questions. Effects of
TO SHOW THAT AIR HAS WEIGHT Drive a thin nail by the exact centre of a long rod such as a metre stick or a yard stick. Balance the stick by resting the nail on the rims of two
how much far sun from earth
what is the name of the theory that explains plate movement?
Explain Internal Respiration What do you understand by the term 'internal respiration'? Well, the interchange of gases between the blood and cells of the body is internal respi
Decline of european science: By the middle of the second century B.C., the Greek empires were collapsing in anarchy andunder the weight of the more vigorous power of Rome. I
Importance of nutrition: We cannot live without food. Our hunger can be satisfied by any kind of meal, but to remain healthy and free of disease, our body requires certain kin
advanced in live zoology
Freezing by Contact with a Cooled Gas Different methods are available for freezing by contact with cooled gas. These include: i) Cabinet Freezing: This method involves ci
Metabolism All of the organized chemical reactions in a cell which are under the control of enzymes.
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