To filter a large quantity of water , a layer of _____________and pebb

1.	To filter a large quantity of water , a layer of _____________and pebbles is also used as a filter.
Answer» ANSWER: sand or mud is REQUIRED as a FILTER for filtering WATER

To filter a large quantity of water , a layer of _____________and pebbles is also used as a filter.

Answer»

sand or mud is REQUIRED as a FILTER for filtering WATER