Test: Soil - 2

Clay soils have little air. But they are heavy as they hold more water than the sandy soils. The best topsoil for growing plants is loam. Loamy soil is a mixture of sand, clay and another type of soil particle known as silt.

Loamy soil is best suited for cultivation as it contains the desired nutrients and water holding capacity. 

Fertilizers are added to the soil to replace the lost minerals such as nitrogen, iron etc.

Humus is added to the loamy soil to make it richer in nutrients and minerals for the better growth of plants.     

Sandy soil is gritty in texture.

Humus, silt, clay and sand all are parts of soil

Humus that is made up of dried rotten plant and animal matter is organic in nature and is responsible for the formation of minerals.

Clayey soil is used to make pots, toys and statues.

Humus is made up of decayed plants and animals.

Hard rock contains mainly bed rocks and is deficient in nutrients.