Soil (Class- VII)

Sand soil particles are large in size. Hence, water retention capacity is very less. Thus, it provides good aeration.

Good fertile soil is neither too acidic nor basic. It is slightly acidic in nature.

Soil contains water, air, rock, minerals and organic matter. Its vertical section shows all the layers in detail.

Loamy soil is composed of sand, silt and clay soil to some extent. It is perfect soil for gardening. It retains water very easily, and the drainage is also good.

Clayey soil has the highest water holding capacity. This is because its particles are tightly packed and does not allow water to percolate through.

The upper most horizon is rich in humus, which makes the soil fertile.

It is because the particles of the soil are very tightly packed leaving little space for air.

Soil profiles shows different layers of soil, and each layer is known as soil horizon.

This is a hard and rocky layer known as bedrock. It is below the third layer.

The best top soil for growing plants is loam. It is a mixture of sand, clay and silt.

The relative proportion of different sizes of particles present in soil determines its texture.

The soil, which can drain water easily and hold air is best for cotton.

The humus and minerals present in the top soil gives it a dark colour as humus is dark brown black in colour.

Humus is present in good amount in the top soil, which makes the soil fertile and provides nutrients to the growing plants.

The breaking down of rocks by the action of wind, water and climate is called weathering.