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FACULTY: SOCIAL SCIENCE
DEPARTMENT: ECONOMICS
AN ASSIGNMENT
PREPARED IN PARTIAL
FULFILMENT FOR THE REQUIREMENT OF THE COURSE GEO102 (MACRO ECONOMICS THEORY II)
TOPIC
THEORIES OF INVESTMENT
BY
NAME: OBIKE MARTHA .O.
REG NO: 2015/200435
LECTURER: MR NCHEGE JOHNSON
JUNE,2017.
WHAT
IS SOIL: Soil is
a mixture of minerals, organic matter, gases, liquids, and countless organisms
that together support life on earth. Soil is a natural body called the
pedosphere which has four important functions: it s a medium for plant growth;
it is a means of water storage, supply and purification. It is a modifier of earth’s
atmosphere; it is a habitat for organisms; all of which, in turn, modify the
soil.
Soil is
called the skin of the earth and interfaces with the lithosphere, the
hydrosphere, the atmosphere, and the biosphere. The term pedolith, used
commonly to refer to the soil, literally translates ground stone. Soil is a product of
the influence of climate, relief (elevation, orientation, and slope of
terrain), organisms, and its parent materials (original minerals) interacting
over time.
FORMATION OF SOIL
Soil
formation, or pedogenesis, is the combined effect of physical, chemical, biological
and anthropogenic processes working on soil parent material. Soil is said to be
formed when organic matter has accumulated and colloids are washed downward,
leaving deposits of clay, humus, iron oxide, carbonate, and gypsum, producing a
distinct layer called the B horizon. How soil formation proceeds is influenced
by at least five classic factors that are intertwined in the evolution of a
soil. They are: parent material, climate, topography(relief), organisms and
time.
