7. Uses of soil :
a. Soil can be given any desired shape. This property of the soil is called plasticity.
b. Soil nurtures plants.
c. Soils holds water.
d. Bricks that are used for construction work are made from the soil.
e. The earthen vessels and walls of some houses are made of clay (soil).
8. Colour of the soil :
a. The soil has different colours. It may be red, black, yellow, and copper coloured.
b. The colour of the soil gives an idea of its fertility, drainage and other such properties.
c. The colour of the soil depends upon the following constituents.
i. Texture ii. Organic content and iii. Chemical substances like iron, quicklime, etc.
9. Soil also contains find particles of quartz, feldspar, nica, carbonates of metals, oxides and sulphides of iron along with the organic matter.
10. Types of soil : ( According to use )
a. There are three types of soil , viz., China clay, clay and loamy soil.
b. The China clay or Kaolin is found near the Kaolin mountain in China.
c. It is white in colour and is used for making crockery, tiles for bathrooms and laboratory apparatus.
d. Different lines of oxides are used to decorate earthenwares or porcelain articles. For example, iron oxide is used to obtain red colour while copper oxide is used to obtain green colour.
e. Loamy soil being white in colour is used to make idols and statues.
11. Types of soil : (According to texture)
a. The size of soil particles decides the texture of soil.
b. There are three types of soils based on the texture. There are sandy soil, clayey soil and silt.
c. Sandy soil has greater proportion of fine sand. It has the least capacity for holding water.
d. Clayey soil has greatest capacity for holding water.
e. Silt soil consists of find to medium sized soil particles. It has medium capacity for holding water.
f. The soil which holds lots of water is not well aerated.
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