1. Natural Environment
That kind of the environment which is created by the nature or it is known as the god-gifted environment. The natural environment consists of air, water, soil, forest, wildlife, etc. The elements of the elements of the natural environment can be broadly classified into physical or abiotic factors and biological or biotic factors.
A. Physical or abiotic factors
Physical or abiotic factors of an environment are such climatic factors as solar radiation, temperature, wind, water, ocean current, rainfall and such physical as light, fire, pressure, geomagnetism and such chemical factors as acidity, salinity and the availability of inorganic nutrients needed by plants. The most important physical factors are the climatic, physio-graphic and edaphic factors. Some of the elements of these factors are as follow:-
Climatic or Aerial Factors
a) Light and heat
b) Temperature of air
c) Rainfall
d) Atmospheric gases and wind
e) Humidity of air
Topographic or Physio-graphic Factors
a) Formation of soil
b) Physical structure
c) Chemical properties
d) Substrata of soil
The interaction of all these factors affects the natural environment and the life of all living beings. Under the natural conditions, an organism is affected not only by one individual factor but by all the environmental factors. The life of living beings thus involves the simultaneous and continuing impact of all existing environmental factors. All these factors are inter-related and variation in one may affect the other. For example, an increase in temperature may bring a change in humidity in addition to the rate of photosynthesis.
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