Fill this brightly coloured Sieve with lots of sand, soil or water and shake, shake, shake! Watch as the water pours straight through but the sand and soil trickle through much slower - maybe even leaving stones, pebbles or twigs behind!
Fill this brightly coloured Sieve with lots of sand, soil or water and shake, shake, shake! Watch as the water pours straight through but the sand and soil trickle through much slower - maybe even leaving stones, pebbles or twigs behind!