Raise the disk slowly until it is visible again. Record this measurement. Take an average of the two readings, and this average is the limit of visibility measurement 12. Carefully study the conditions where the reading was taken. Allow different groups to take readings in different places in the same body of water and compare readings.
Turbid water prevents light penetration, thus affecting all plant and animal life.
It also determines, to some extent, the amount and kinds of life the body of water can support. They will become involved in recording scientific data in the study of ecology. To determine the limits of visibility in bodies of water. To compare the limits of visibility in different bodies of water and in different locations in the same body of water. To calculate the average of two measurements in determining the limit of visibility.