Why does water need conservation even though large oceans surround
the land masses?
Why do not lichens occur in Delhi whereas they commonly grow in Manali
or Darjeeling?
Why does moon have very cold and very hot temperature variations eg,
from -190°C to 110°C even though it is at the same distance from the sun
as the earth is?
Why does the percentage of gases like oxygen, nitrogen and carbon dioxide
remain almost the same in the atmosphere?
All the living organisms are basically made up of C, N, S, P, H and O. How
do they enter the living forms? Discuss.
Soil formation is done by both abiotic and biotic factors. List the names of
these factors by classifying them as abiotic and biotic?
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