SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Soil is created by the roots of trees.
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Broken down rocks combine with humus to form soil.
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Animals leave food wastes, which pile up and become soil
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Soil is formed inside the Earth and is pushed out through the crust.
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Detailed explanation-1: -Complete answer: The method by which soil is formed is called weathering. Weathering is the process of breaking down rocks by the action of heavy wind, water flow, and climate. Breaking down of rocks yields some small particles which mix with hummus. This mixture of small rocks and humus makes the soil fertile.
Detailed explanation-2: -Soil is formed from rocks through weathering. By the action of wind, moisture and rain, rocks break down into smaller peices.
Detailed explanation-3: -Animals eat plants and their wastes and eventually their bodies are added to the soil. This begins to change the soil. Bacteria, fungi, worms and other burrowers break down plant litter and animal wastes and remains, to eventually become organic matter. This may take the form of peat, humus or charcoal.
Detailed explanation-4: -Humus is an organic substance which is formed by decomposition of plant material and leaves by the microorganisms present in the soil. Hence, the mixture of rock particles and humus is called soil. Therefore, the correct answer is soil.
Detailed explanation-5: -This physical and chemical decomposition is primarily done by wind, water, and climate. As a result of these processes, large rock pieces are converted into smaller pieces and eventually to the soil.