Give them each a sheet of newspaper and direct them in the following drawing:
 
 
 
 
 
 I used a black oil crayon to do the drawing and then mixed up some food colouring with water for the paint. I find that the food colouring mixture works better on newsprint and gives a lovely smooth and vibrant result.
 
 
 Once dry, I trimmed the edges and it is ready for display!
Here are some more activities for Earth Day: