This hands on lab allows students to see first hand how porosity (the pore space in rocks and soil due to particle size) is directly related to water retention and water run-off in rocks/soil.
I encourage you to teach about porosity and particle size before students complete the lab. This way they can enter the lab with porosity in their schema.
To complete this lab you will also need (per group):
-1 cup of each: soil, sand, and pebbles
-6 plastic cups
-pitcher of water