what natural things filter water?!


Question: What natural things filter water?
such as rocks, sand, and grass. Please hurry I have a project due in a day

Answers:

Best Answer - Chosen by Voters

Try this, hope it helps.

http://www.teachersdomain.org/resource/e…

http://www.teachersdomain.org/resource/e…

ITS AMAZING I find this. http://www.amazon.com/Rocks-Pebbles-And-Sand/dp/B001AKFCLG%3FSubscriptionId%3DAKIAISJDSS4FGFKOAYFQ%26tag%3Dyan006-20%26linkCode%3Dsp1%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB001AKFCLG

http://www.amazon.com/Rocks-Pebbles-And-Sand/dp/B001AKFCLG%3FSubscriptionId%3DAKIAISJDSS4FGFKOAYFQ%26tag%3Dyan006-20%26linkCode%3Dsp1%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB001AKFCLG

try this, it rocks! http://gooods.info/296510/rock-sand

http://gooods.info/296510/rock-sand

All of the above - especially sand


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