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Net Radiative Flux (NRF) is used to determine the flow of solar energy in and out of the Earth system. NRF is influenced by seasonal variations related to the tilt of the Earth's axis and degree of cloud cover as well as Earth’s surface features. Using measurements taken by the CERES instrument, students will observe and analyze NRF patterns. Analysis will focus on seasonal shifts and the impact of both surface features and clouds. This lesson uses student- and citizen science-friendly microsets of authentic NASA Earth system science data from the MY NASA DATA project. It also includes related links, extensions, an online glossary and a list of related AP Environmental Science topics.