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  • SOIL
    PHYSICAL GEOGRAPHY

    SOIL

    Soil is defined as the thin surface of the uppermost layer of the earth’s crust on which plants grow. Components of the soil The soil is made up of five components which are: Mineral or Inorganic Matter. Organic matter. Soil water. Soil air. Living organisms.   Mineral or Inorganic Matter: The mineral matter represents small rock fragments of the soil. It forms the bulk of about 45% of total volume of the soil. It consists of gravel, stones, sand, silt and clay. Importance/Effects of Mineral Matter on Agriculture It forms the solid part of the soil which provides support for plants. Mineral matter is the main source of plant nutrients…

  • LEARN ABOUT THE STRUCTURE AND COMPOSITION OF THE EARTH
    PHYSICAL GEOGRAPHY

    LEARN ABOUT THE STRUCTURE AND COMPOSITION OF THE EARTH

    Isaac Newton was one of the first scientists to theorize about the structure of Earth. Based on his studies of the force of gravity, Newton calculated the average density of Earth and found it to be more than twice the density of the rocks near the surface. From these results, Newton realized that the interior of Earth had to be much denser than the surface rocks. His findings excluded the possibility of a cavernous, fiery underworld inhabited by the dead, but still left many questions unanswered. Soon after the Earth formed, unique processes occurred – division into metallic core, silicate mantle and crust – which, along with surface water, made…

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