Dirty Science


What Makes Soil Become Dense?


Soil is the top layer of the Earth's surface like the frosting on a cake. It is the stuff that grass grows on and that baseball players play on. You probably call it dirt.

Believe it or not, our lives depend upon soil. The rock that make up soil made of the minerals that our bodies need to live and grow. If we don't get those minerals into our bodies we get sick for sure and maybe even die.

Luckily for us, we don't have to go around eating rocks or soil because we havet plants to do it for us. Plants take up the minerals thar are in the soil. When we eat the plants ...  B-I-N-G-O, we get the minerals! Check out the Soil page to find out more about soil.

But if the soil is "compacted" (meaning squiched too tiightly) things start going wrong. 

This earthy activity from the Scientific American's Activity Buddies program will help you understand what soil "compaction" is. Give it a try.

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