soil is an example of
natural sources
Answers
Explanation:
Soil is one of the world's most important natural resources. Together with air and water it is the basis for life on planet earth. It has many important functions which are essential for life.
Soil consists of a mixture of mineral grains that come from the rock deposits and sediments beneath them.
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Answer:
yes it is true
Explanation:
What is the most valuable abiotic factor in an ecosystem?
• Soil – because everything that lives on land depends directly or indirectly on soil.
• If soil quality changes in any of its properties, the ecosystem (including life forms) will also change.
What is soil quality based on?
• Soil profile
• Composition
• Texture
• Particle size
What is soil profile?
• Soils form in layers, or horizons, and all the layers make up the soil profile.
• A mature soil profile consists of 3 layers – topsoil, subsoil, and parent material above bedrock.
• Topsoil that is nutrient rich, containing a mixture of humus, clay, and minerals, is most suitable for plant growth.
• Most animals live in the topsoil horizon.
What is composition?
• Soil is a mixture of rock particles, minerals, decayed organic materials, air, and water.
• The decayed organic matter in soil is humus.
• The sand, silt, and clay portion of soil comes from weathered bedrock material.
• The combination of these materials in soil determines the soil type and affects the types of plants that can grow in it or animals that can live in it.
• Factors that may affect soil type are the types of plants, climate, time, and slope of the land.
What is Texture?
• Soil texture depends on the size of individual soil particles and is determined by the relative proportions of particle sizes that make up the soil.
• Texture names may include loam, sandy clay loam, silt loam, or clay depending upon the percent of sand, silt, and clay in the soil sample.
• The texture affects the amount of water that can be absorbed for use by plants and animals.
What is particle size?
• Soil particles are classified by size ranging from coarse sand to very fine sand to silt, and finally to the smallest particle, clay.
• Soil particles that are larger than 2mm are called gravel.
• Particle size also affects the amount of water that can be absorbed and used by plants and animals.
What are the 2 properties determining soil quality that can be measured?
• Permeability
• pH
What is permeability?
• Soil particles have open spaces (pores) between them that let water flow through.
• How freely that water flows is the permeability of the soil.
• The closer the particles pack together because of particle size, the less permeable the soil is.
• Measuring permeability involves calculating the rate of drainage.
What is pH?
• Soils can be basic or acidic and usually measure 4 – 10 on the pH scale.
• Indicators can be used to measure the pH of soils.
• Most plants grow best in soils with a pH of between 5 and 7.
• Regardless of the nutrients present in the soil, if the pH is not suitable those nutrients will be inaccessible to the organisms.
• Lime is a kind of fertilizer that alters pH and making the soil nutrients more accessible.