Question

What is soil erosion?\nwhat causes it and how can it be prevented?\nhow was soil formed?\nhow was water vapour formed?

Answer 1

removal of upper layer of soil is called soil erosion. cause ,deforestation.

Answer 2

Soil Erosion:
The washing away of the valuable topsoil is called erosion. Erosion occurs not only because of water but also by the action of wind and ice. Erosion destroys agricultural lands as the nutrients are washed away along with the soil. Therefore, it is important to prevent soil erosion.

CAUSES:
Soil erosion is when the soil is blown away by the wind orwashed away by the rain.
Soil erosion is common in areas with steep slopes, where trees have been cut down, in droughts when crops and other vegetation grows poorly and in rural areas which are overpopulated. Nepal, in the Himalayan Mountains, has severe problems caused by increased population density and steep slopes.

Soil erosion can be reduced by building terraces on hillsides, irrigation schemes to overcome droughts, planting more trees to bind the soil together and make wind breaks, and using fertilisers in overpopulated areas to make the soil more fertile. It is very important that the farming techniques used do not damage the structure of the soil, as this makes it easily eroded. Good farming techniques include contour ploughing, crop rotation and keeping the soil rich in humus.

PREVENTED:
1)Afforestation (planting of trees)
2)Prevention of the cutting of trees
3)Prevent over-grazzing

Soil is formed by a process called weathering. The process of weathering occurs as a result of the action of wind, water, or climatic changes. Weathering is the process that breaks down large rocks into smaller pieces. These small pieces of rocks form soil by mixing with decaying plants and animal parts.

Water vapor is formed by evaporation. Heat or energy breaks the bonds that hold the water molecules together. Evaporation actually removes heat from the environment which is why you feel cooler when your sweat evaporates.

In the most general sense, water vapor is formed through a process that is known as water evaporation. Water vapor is actually the gaseous state of water particles.