Erosion carries away soil from
Image from Cunningham and
Saigo, Environmental Science:
A Global Concept, 1997
Fill two boxes about 3/4 of an inch full with soil.
Set them on a table propping up one side so that there is an angle that makes a slope.
Cut out a spout at the lower end of each box and place a jar below each spout.
Now, using your finger make furrows across the soil in one box and up and down in the other.
Then fill two watering cans or cups with water and sprinkle the water over each box at the same time and rate.