تماشای ویدئو Absorption by sand and soil Types of soil Biology از آی-ویدئو

This activity demonstrates the difference in the water retention abilities of soil and sand. Use filter paper to create two cone and fill one with soil and the other with sand, taking care to use equal amount of material. Soil is a combination of clay and humus, the composting remains of organic material such as fallen leaves and dead matter.. Pour equal amounts of water through these two cones and measure the water that flows through them. Less water is collected under the cone with soil, showing that the
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