March is World water day. UN recommends 50 liters of water
per person per day. 2003 was the international year of
freshwater observed by the UN. 2005-2015 was the
international decade for action on WATER FOR LIFE.71 % of
earth is covered with water.
Properties of Water
has high boiling point, high freezing point, high heat
heat of fusion [controls body temperature],
heat [leads to moderation of temperature of climate],
solvent [helps in transportation of ions in plants],
[acts as acid and base] and high dielectric constant.
This is due to extensive presence of strong bond between
Hardness of Water
hardness of water is due to calcium and magnesium
hydrogen carbonates. It can be removed by boiling and
addition of lime. This converts them to carbonates and
hydroxide which are soluble.
hardness is due to presence of Magnesium and calcium
chlorides and sulphates it is treated using washing soda.
are underground water resources where water is stored
between rock layers.
Earths Water Composition:
lakes and inland sea– 0.008%
1: WATER SUPPLY
rains, the canopy of trees allows water to trickle down
slowly via stems and roots to theground. This ensures that
water doesn’t hit ground directly as it could lead to damage
to the soil by erosion.
fires we must wrap a woolen blanket over a burning object
to cut off the supply of air to it
heavy rains, water flows into soil and covers all air
pockets so earthworms rise to the surface to breathe.
peroxide is used as a bleaching agent, treating industrial
effluents and pollution control.
trees should be planted along sewage lines as these absorb
wastewater and release water vapor into the atmosphere.
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