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Natural disaster such as forest fires and severe floods, as well as human activities, can cause damage to land. When this happens, the land can no longer used for certain activities. Such damaged land is known as derelict land
improper farming practices
the fertility of arable land can be lost through poor farming practices. As crops are grown too quickly one after another, there is insufficient time for the nutrients to be replace, resulting in loss of soil fertility.
farming practices like excessive ploughing of land can also cause a large amount of soil erosion by water. When this happens, nutrients are lost and soil is no longer suitable for cultivation
In some cases, land can also be damage through mining . In the process of mining an area for mineral ores , vegetation and soil have to be removed because the minerals are found in the ground. Enormous holes are dug in the ground and these form dangerously deep mining pools when they become filled with rainwater. Heaps of mining waste are also left behind. The waste may contain poisonous substances that contaminate the soil