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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
Checking Breathing and Pulse : Before attempting to resuscitate a casualty, it is essential that you check his/her breathing rate and pulse. You can cause problems if you attempt
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Evaporation in a mist of little drops is sometimes used to cool hot, dry air. Let Consider the Temperature in a spherical drop of liquid that is evaporating slowly enough that its
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Acid solution weathering Weathering is accelerated by the presence of the hydrogen ions in water. Rain water dissolves CO 2 from air to form carbonic acid, H 2 CO 3 . When t
COPD
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