Complete the following statements.
A. Topsoil is a resource because
microorganisms
B. Fertility of topsoil requires a balance of
C. It takes 500 years for
Answers
Explanation:
A. Topsoil is the upper, outermost layer of soil, usually the top 5–10 inches (13–25 cm). It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. Topsoil is composed of mineral particles, organic matter, water, and air. Organic matter varies in quantity on different soils. The strength of soil structure decreases with the presence of organic matter, creating weak bearing capacities. Organic matter condenses and settles in different ways under certain conditions, such as roadbeds and foundations. The structure becomes affected once the soil is dewatered. The soil's volume substantially decreases. It decomposes and suffers wind erosion.
B. SOIL FERTILITY. Crops need nutrients just like people do. A fertile soil will contain all the major nutrients for basic plant nutrition
C. Plastics takes 500 years to Bio-degrade in water (ocean , lakes , rivers .....)
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