Science Fair Projects with Soil - Part 2

Activity 4

Dig some soil from your garden or field. Put it in a glass tumbler or a wide mouth bottle filled with water. Observe the evolution of air bubbles. You can repeat this activity by taking soils from different areas, like near a pond or near the drains. Make a comparison in the number of air bubbles evolved by taking same amount of soil from different places. This activity gives an idea that soil contains air.

Activity 5

Collect a few samples of soil from a lawn or a garden, paddy field, marshy land, pond and drains. Dissolve each one of them in water in separate containers. Mix the soil properly and allow it to settle down. Take note of plants and organisms or their body parts present in each container. If possible, count their number and record their types.

 Activity 6

Take two trays or baskets. Fill them with garden soil. Grow grass or some cereal in one of them and water it properly for a few days. Now keep both the trays in a slightly inclined position by placing a brick below their one side. Let the water fall on both the trays. You will find that the water that flows from the tray with vegetation contains less amount of soil particles in it. This is due to the fact that the roots of plants bind the soil and do not allow it to flow with water