Stuck in someone else's frames? break free!

HomeScience HomeLiquids Home

Animals HomeAstronomy HomeAtoms HomeEcology HomeLiquids HomeMeteorology HomeMicroorganisms HomeOceanography HomePlants HomeSolids Home


What is filtering?

Let's find out by putting a cotton ball into the hole in the bottom of a plant pot. We'll put several inches of clean sand into the pot, and the cotton will act as a plug to keep the sand in the pot.

Now, we'll put muddy water on top of the sand--maybe a cupful or so. The pot will be sitting in a little bowl, and the water seeping through the sand, and through the cotton, will collect in the little bowl.

How does the water look? Let's look at some of the muddy water, and compare that with the water that seeped out of the bottom of the pot.

So what? What's the big deal about filtering muddy water through clean sand?

This is what: this is the way that filtering is done in nature. It rains onto the ground, and makes mud-puddles. The muddy water soaks into the ground, and as it goes deeper and deeper, the earth through which the water seeps acts as a filter. By the time the water gets to the water table or an aquifer (pronounced "AH-kwif-fer"), the yucky stuff has been filtered out of the water.

Of course, some kinds of yucky stuff can go right through the filter. Also, if the soil itself is polluted, like with garbage or chemicals, the water will be contaminated by the

What can we do about that? Let's each write a short essay about contamination and what to do about it.

What on earth is an aquifer?


Contact Spike
Any problems with this page? Send URL to webmaster.  Thank you!
Add to Favorites
Search this site powered by FreeFind

Send this page to a friend

Back to Spike's & Jamie's Recipe Collection





Sign Guestbook    View Guestbook


We publish two newsletters a couple of times a month. To subscribe, send a blank email to the appropriate email address.  Topica will send you a message asking if you really intended to subscribe - just click reply - that's it!

Free Recipe Collection Newsletter:

Jewish Recipe Collection Newsletter:



Barnes & Noble Home Page  Barnes & Noble Music Page


Tired of Geek Speak when 
you have Computer Questions?