Page 30 - York Global Science 6 - Physical Science

Hydrologists watch the water in the
water cycle and measure it to help

them understand how much water
there is in different places. This can
help to find any problems and can
also help to predict rainfall, floods

and droughts.
Measurements are also made to
see how much pollution there is and

what is happening because of acid
rain.

How much water is underground
and in reservoirs can be measured

and compared to how much water
people use. This information is
then used to decide how to control

the water on Earth to make sure
that people have enough fresh
(clean) water.
Hydrologists also help to decide

where new towns and cities
should be built. It is important that
new places have enough water.

A lot of water on Earth is stored

as snow in the mountains. This
provides more fresh water when
the snow starts to melt. In some

places, the water that is stored as
snow provides up to 75 per cent
of the fresh water in that area.

30