OBJECTIVE FORESTRY

Detailed explanation-1: -The inorganic material of soil is composed of rock, which is broken down into small particles of sand (0.1 to 2 mm), silt (0.002 to 0.1 mm), and clay (less than 0.002 mm). Loam is a soil that is a mix sand, silt, and humus.

Detailed explanation-2: -The inorganic or mineral fraction, which comprises the bulk of most soils, is derived from rocks and their degradation products. The power to supply plant nutrients is much greater in the larger particles, sand and silt, than in the fine particles, or clay.

Detailed explanation-3: -Parent materials. Soil minerals form the basis of soil. They are produced from rocks (parent material) through the processes of weathering and natural erosion. Water, wind, temperature change, gravity, chemical interaction, living organisms and pressure differences all help break down parent material.

Detailed explanation-4: -Soils usually contain inorganic material of three sizes: sand, which ranges in diameter from 0.2 to 2 millimetres; silt, between 0.02 and 0.002 millimetres in diameter; and clay, which is less than 0.002 millimetres. Most soils have some of each. Soils with a large proportion of each component are called loams.

Detailed explanation-5: -The C horizon, or soil base, includes the parent material, plus the organic and inorganic material that is broken down to form soil.