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| Land changes |
How does the land changes
There are many changes to the land that are brought about by nature and by us. A portion of the significant ones are examined beneath:
1. Land Pollution
We generate a lot of waste everyday from our homes and industries. The waste is dumped on the land. Some of the waste from our homes and most of the waste from industries contain poisonous substances which destroys the land.
Water Pollution:
We pollute water by dumping sewage from our homes, poisonous materials from industries and pesticides and fertilizers used in agriculture into the water. Polluted water Causes a decrease in the number of fish, a lot of diseases and even the death of many people especially children who drink the water.
Deforestation :
The permanent destruction of natural forests is known as deforestation. As the population grows more land is needed for us to live and to grow food for us to eat so we cut own forests. Deforestation Causes immediate loss of homes for wildlife, over time forest land turns in deserts. hen forests on mountains are cut down it causes avalanches.
Water logging and salinity :
Our agricultural land is irrigated through a network of canals taken out from the River Indus. The water flowing in these canals slowly seeps into the ground and raises the evel of the water underground. Mineral salts in the ground dissolve in the water. Sometimes, the water rises above the land and the land gets covered with water. This process is known as ‘waterlogging’. In the hot sun, the water evaporates, leaving a layer of salt on the ground. This is called ‘salinity’. Crops cannot grow in waterlogged or saline soil.
5. Soil erosion
The surface layer of the land is called soil. Soil is composed of minerals, particles of rock and living organisms like earthworms. The few centimeters of topsoil upon which agriculture depends, has taken hundreds years to develop. Heavy rain, floods and winds carry particles of the soil away making it useless for farming.
