A2010
B2012
C2015
D2018
Answer:
C. 2015
Read Explanation:
Evolution of soil
The soil is formed by prolonged processes like weathering of rocks and decomposition of organic matter.
Pedology Branch of science that deals with soil. The scientists associated with this branch are called pedologists.
Factors influencing soil formation:
Climate - Soil formation will be slow in cold environments.
Topography – Soil will be thin along steep slopes.
Parent rock - The minerals and the structure of the soil depend on the rock from which it is formed.
Time – Thickness and structure of soil depends on the time taken for its formation.
Plants and animals – The acid formed as a result of the decaying of plants and animals cause weathering of rocks.
Disposal of non-degradable materials like plastic.
Overuse of chemical fertilizers that alter the structure of soil.
Unscientific construction and quarrying.
Use of agricultural land for non-agricultural purposes.
Draining wastewater into soil on a large scale.
Overgrazing.
Top soil is essential for the continued sprouting of life. Check deforestation, Crop rotation, Terrace along hill slopes, Construction of check dams are some ways of soil conservation.
The UNO observes the 5th of December as the World Soil Day
2015 was celebrated as the International Year of Soils.