In this activity, you will use an inexpensive spectrophotometer* to test how light at different visible wavelengths (blue, green, red) is transmitted, or absorbed, through four different colored water samples.

Explore and connect to the GLOBE ENSO (El Niño Southern Oscillation) protocol bundle. 

GLOBE protocols and learning activities that complement the El Niño Southern Oscillation phenomenon through hands-on investigations are detailed.

Background information on the El Nino Southern Oscillation or ENSO.