(a) Explain with the help of a diagram
7. Answer in your own words.
how soil is formed.
(b) Why is there a shortage of water
even though it occupies about 71%
of the earth's surface?
(c) What are the various constituents of
air ? Write their uses.
(d) Why are air, water and land
considered to be valuable natural
resources ? please Mera question ka answer jaldi do na all sabhi ka please aur short mein please please
Answers
- soil formed due to a rock down on mountains then it breaking of rock in small particles this type soil is formed
- Because all the 71% is in the form of salty water present in oceans and seas. so it cannot be utilized for daily purposes like bathing, drinking etc. so for clean water there is only 3% cleanair is composed of several gases.
- The composition of air consists of three key components of air, namely Nitrogen (78%), Oxygen (21%), Argon (1%), Carbon-di-oxide (0.03%) and water vapor and other gas
with their use::
nitrogen : nitrogen help in nitrogen fixation to help in nitrogen cycle.
Oxygen: oxygen help in respiration and also for plants growth without oxygen human not live
Argon:argon is an asphyxiant and inhalation of it can lead to dizziness and nausea in a person.
carbon dioxide: Carbon dioxide is infused in the air due to respiration. Living beings inhale oxygen and exhale carbon dioxide
water vapour:When the water present in the water bodies evaporates due to heat, it rises up and mixes into the atmosphere. You can assess the presence of water vapor in the air by measuring the humidity level.
other gases:Apart from the natural gases, air also contains things like smoke and dust.
4. Air, water and land are natural resources i.e they are provided to us by nature. Land resources are considered to be a natural resource of utmost importance because they support natural vegetation, wildlife, human life, economic activities etc. Air is important for all the living organisms.
in short answer
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