Page 46 - York Global Science 6 - Physical Science

There are many different types of filter.
Small holes in a filter can give a cleaner

filtrate but it takes more time. Sometimes,
filtration is done in parts. coarse gravel

Different filters with different sizes of holes fine gravel

or spaces are used to filter out different fine sand
particles. cotton wool

Filtration can be used to get clean water

from dirty water. The ground works as a
natural filter for water.

When water sinks into the ground, the

sand and gravel take out any solids that are suspended in the water. Some
people depend on wells to provide clean water for them to use.

well

rock through
which the water
travels through

filter this is the layer of
rock above the
aquifer

groundwater

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