Thursday, August 13, 2015

Grade 4 – Soil - 11th August, 2015

2 experiments were conducted to understand the concept of the effects of wind and water on soil.
2 students were asked to fan 2 objects; one potted plant and a tray with soil. The root of the plant holds the soil firmly hence no soil particles were dispersed however the soil kept in tray was blown away due to the wind. This demonstrates how soil erosion takes place at barren land and explains us that planting trees is essential to prevent soil erosion.

Another experiment was conducted where one tray was placed on a flat surface and another tray was kept tilted. Water was poured over the soil and students were asked to observe.
The soil remained in place in the first box however the soil in second tray was washed away.

The students learnt that more soil erosion is caused by water flowing downwards a slope.




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