When rain gathers on the ground it sometimes forms a puddle. This can change size during the day, which you can measure.
What you will need:
- A puddle
- A piece of chalk
What to do:
- Choose a day when there has been rain overnight and the rest of the day is expected to be dry, warm and sunny.
- Choose a puddle and first thing in the morning use a piece of chalk to draw around the puddle.
- A few hours later go back and draw around your puddle again. Repeat this several times during the day.