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the importance of water to life on earth (The uses of water for flora,…
the importance of water to life on earth
Water
Key to understanding the evolution on life on Earth
provides a medium that allow organic molecules to mix and form more complex structures
The Goldilocks zone
the fact that water is everywhere is due to the distance for earth to the sun
importance of water can be appreciated when we compare earth to mars
evidence that there is a very small amount of water on the surface
chance that there
may
be life on Mar
the perfect zone for water to exist
How water moderates the environment
Benign thermal conditions on earth
E.g. Oceans moderate temps by absorbing heat, storing it and releasing it slowly
clouds
made of tiny water droplets and ice crystals
Reflect around a fifth of incoming solar radiation
Lowers surface temp
Water vapour
Absorbs long-wave radiation from the earth
Helping to maintain average global temps almost 15ºC higher than they would be otherwise
The uses of water for flora, fauna and people
makes up of 64-95% of all living organisms
Crucial for growth, reproduction and other metabolic functions
Plants
Need water for photosynthesis, respiration and transpiration
Require water to maintain their rigidity
used to transport mineral nutrients from the soil
Transpiration of water from leaf surfaces cools the plants by evaporation
Animals
medium for all chemical reactions in the body
panting
People
medium for all chemical reactions in the body
sweating
Essential resource for economic activity
used to
Generate electricity
Irrigate crops
Provide recreational faculties
satisfy public demand
e.g. sewage and drinking water
huge range of industries
e.g. food manufacturing and paper making